PyEnum: Define a fixed list of Int(Enum|Flag) decisions

This was "PyEnum: Write a default Int decisor for Enum and Flag".

Historically, C++ enums were all compatible with int.
The new Python enums are more diverse here. There are the
basic types Enum/IntEnum and Flag/IntFlag.

We have tried a lot to come up with a sensible default heuristic
computed from the data. In the end, this was reverted and replaced
by a fixed list that was collected from similar implementations.

By the move away from Int inheritance, a few classes needed extra
support. Python 3.11.0b5 also required the Flag creation parameter
"boundary=KEEP". It is not clear if this is correct, yet.

[ChangeLog][shiboken6] Most former IntEnum/IntFlag are replaced
by pure Enum/Flag classes in a generally compatible way to other
implementations.

Change-Id: I1dbe7b0556a3375df89eb40e9d9f495f14bf42b1
Pick-to: 6.3
Task-number: PYSIDE-1735
Reviewed-by: Qt CI Bot <[email protected]>
Reviewed-by: Shyamnath Premnadh <[email protected]>
Reviewed-by: Friedemann Kleint <[email protected]>

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