Explicitly compare MaybeType objects by name

[filmor]

What does this implement/fix? Explain your changes.

As observed by @rayfalling, multiple instances of ReflectedType values might be created in the cache, leading to crashes during stashing.

@rayfalling, could you provide a test-case for this?

Does this close any currently open issues?

#2269

Any other comments?

...

Checklist

Check all those that are applicable and complete.

• Make sure to include one or more tests for your change
• If an enhancement PR, please create docs and at best an example
• Ensure you have signed the .NET Foundation CLA
• Add yourself to AUTHORS
• Updated the CHANGELOG

[rayfalling]

What I meet is a Unity Project with FingerGesture plugin
I will prepare Unity Project test case tomorrow
It's nine o'clock in the evening now, I need to get off work first :)

[rayfalling]

This is the test-case.
You can open it in Unity 2019.4.38f1
minimalTest.zip

[lostmsu]

Do you know circumstances under which this happens? What is the scenario when we can have two different MaybeType with the same name? Perhaps this is what needs to be prevented instead.