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Make QSpan public API.

Acceptance criteria:

QSpan is implemented as public API
feature parity with std::span (https://en.cppreference.com/w/cpp/container/span)
- exceptions:
  - where use of concepts would be required (https://en.cppreference.com/w/cpp/container/span/span #7)
  - accepts rvalues of owning containers, too
documented (→ ~~QTBUG-115089~~ should have done that, so it's just a matter of removing the \internal marker)

is blocked by

QTBUG-118080 QDoc cannot distinguish between template function overloads differing only in template arguments

QTBUG-112461 Implement q20::ranges CPOs (prereq for QSpan)

QTBUG-108430 Implement q20::to_address (prereq for QSpan)

QTBUG-115089 Document QSpan

QTBUG-108124 As a developer of Qt, I'd like to have a {{QSpan}} for internal use

is required for

QTBUG-113420 QList/QVLA: add a assign(QSpan<const T>) overload

(1 is required for)

For Gerrit Dashboard: QTBUG-115022
#	Subject	Branch	Project	Status	CR	V
489118,8	Long live QSpan as public API!	dev	qt/qtbase	Status: MERGED	-1	0
562036,2	[docs] QSpan: enable 2nd subspan() overload docs	dev	qt/qtbase	Status: MERGED	+2	+1
562087,2	[docs] QSpan: enable 2nd subspan() overload docs	6.7	qt/qtbase	Status: MERGED	+2	0