Implement GET tasks, taskDetails and workItemDetails APIs

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------- COIN API ENDPOINTS -------

===================================

GET /tasks

PARAMS
	{
		max: int # OPTIONAL, max count of responses to return. Default=100 (Maximum=1000)
		repo: str/list[str] # OPTIONAL
		branch: str/list[str] # OPTIONAL
		type: str/list[str] # possible types [Integration, StatusCheck, EarlyWarning, CreateDebugVm, HealthCheck]
		before: ISO 8601 datetime # OPTIONAL, Exclusive. Default=[current datetime]
		after: ISO 8601 datetime # OPTIONAL, Inclusive. Default=[current datetime - 10days]
		state: str/list[str] # OPTIONAL [Running, Passed, Failed, Cancelled, Insignificant]
	{

RESPONSE
	more: bool # True if more results than the requested max count exist
	next: str # OPTIONAL, URL-encoded query string to GET /tasks which auto-populates
		  'before' with the last returned task 'started_on' datetime. This effectively allows
		  iterative calling of the /tasks endpoint until one or less results are returned.
	tasks: datetime-sorted list [
		{
			id: str # Unique Integration ID
			repo: str # Repository targeted for this integration
			branch: str # The branch that the task is operating on
			type: str # possible types [Integration, StatusCheck, EarlyWarning, CreateDebugVm, HealthCheck]
			started_on: ISO 8601 datetime datetime # Datetime the integration request was made
			state: str # possible statuses [Running, Passed, Failed, Cancelled, Insignificant]
			top_sha: str # OPTIONAL, present if type==integration. Sha COIN will place on top of
					 git history when integration merges
			tested_shas: # list of tested shas  (### Move to taskDetail only?)
			self_url: str # The web UI url of this task, on the public testresults.qt.io/coin server if possible. Otherwise "coin/" intranet URL
			is_public: bool # False if the change requires a user to be in TQTC Intranet to view. 
		}
	]

=======================

GET /taskDetail

PARAMS
	{
		id: str # ID of the integration/status check to retrieve
	}
	
RESPONSE
	Details about a single integration
	{
		id: str # Unique Integration ID (self)
		state: str # possible statuses [Running, Passed, Failed, Cancelled, Insignificant]
		verbose_status: str # OPTIONAL, present if COIN has additional detail about a non-pass status.
		top_sha: str # OPTIONAL, present if type==integration. Sha COIN will place on top of git history when integration merges
		tested_changes: # list[str/changeNumbers]
		started_on: ISO 8601 datetime # Datetime the integration request was made
		completed_on: ISO 8601 datetime # Datetime the integration finished/passed/failed/cancelled
		type: str # possible types [Integration, StatusCheck, EarlyWarning, CreateDebugVm, HealthCheck]
		work_items: list[str/WorkitemPath] # List of builds performed
	}
	
=======================

GET /taskWorkItems
	
	PARAMS
		{
			id: str # ID of the integration/status check to retrieve
			type: str/list[str] # OPTIONAL, [Integration, StatusCheck, EarlyWarning, CreateDebugVm, HealthCheck]
		}

	RESPONSE
		{
			work_items: list[WorkItemDetails] # List of work item objects.
		}

=======================

GET /workItemDetails

	PARAMS
		{
			build_key: str # Unique build key of the work item
		}

	RESPONSE
		WorkItemDetails object. See #WorkItemDetails


=======================

GET /taskTestedChanges

	PARAMS
		{
			id: str # ID of the integration/status check to retrieve
		}
	
	RESPONSE
		[
			Change, ... # List[Change] objects which were built/tested in the specified task.
		]


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------------- TYPES ---------------

===================================

Change
# Provides information about a tested change in a task
	SCHEMA
	{
	sha: str # The sha of the change
	repo: str # The repo in which the change exists
	ref: str # The gerrit ref of the change, including patchset
	subject: str # The Subject line of the commit message of the change
	change_number: str # The numerical change number of the change
	change_id: str # The fully-qualified change ID of the change
	links: list[ChangeLinks] # A list of links relating to the change
	}

===============

ChangeLinks
# Provides useful links relating to a change in codereview
# Accessing some of these links may require authentication
	SCHEMA
	{
	web_url: str # The url of the change in the gerrit web UI
	rest_url: str # The GET url of the change in the gerrit REST api.
		see: https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#get-change
	}

===============

WorkItemDetails
# Provides detailed information about a specific build or test run

	SCHEMA
	{
		task_action: str # possible types [build_only, build_and_test, dry_test_run]
		build_key: str # longform unique identifier for this build
		state: str # Possible states [waiting for hardware, running, done, error]
		target_os: str # OS the build is targeting
		target_os_version: str # Version of the target os
		coin_features: list[str] # list of coin features for this build.
		configure_arguments: list[str] # list of arguments passed to configure for this build
		environment: list[str] # list of special environment variables for this build. Format "key=value"
		started_on: datetime # Datetime this build was assigned an agent and began building
                completed_on: datetime # Datetime this build was completed
		storage_paths: BuildTestLinks # List of links to relevant files for this build
                duration: int_s # duration this build ran for. Derivative, calculated from started_on and completed_on
	}


===============

BuildTestLinks
# Path links to relevant build or test data

SCHEMA
	{
		log_web: str # Path of log view on COIN/Testresults
		log_raw: str # Path of the raw plaintext log in gzipped format
		artifacts: str # OPTIONAL Path of the storage location for build logs and testreslts
	}