Fix the ordering of COM interface methods, properties, and events to appear in their originally defined order

[zhuman]

… This was resulting in fatal crashes while running decompiled COM interop code.

#2638

Problem

See #2638 for more details on the problem being solved

Solution

• I have factored out the problem of determining whether native member ordering is required into its own function. If it's not required, ILSpy will still group the members by kind (fields, properties, methods, events).
• Added a new correctness unit test that validates COM V-table ordering does not change across a decompile loop

[zhuman]

Ah, I see ILSpy just moved to .NET 6 in the intervening week and broke my test haha. I will update it to something that works with .NET 6.

[siegfriedpammer]

Thank you for your contribution! Sorry for taking so long to get to this.