GET /taskWorkItems is missing details about host and target OS

Currently only target OS information is provided:

      "target_os": "Windows",
      "target_os_version": "Windows_11_21H2",

It should also provide host information.

Furthermore I see that Coin stores info about the compiler too. It should be included.

Overall, the following should be provided for both host and target:

• os
• os_version
• architecture
• compiler

Maybe have both host and target under a "platform" JSON object.