sealed some internal classes in Controls.Core that are not inherited from (1)

[Lehonti]

Description of Change

Sealed some classes. They are not part of the public API, but this change can help us better track code invariants

[ghost]

Hey there @Lehonti! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[hartez]

What problem are you trying to solve with this?

[Lehonti]

What problem are you trying to solve with this?

There is no problem as such. I am just trying to make the code easier to read and understand, and with less pitfalls (if a programmer sees that a class is unsealed, they may think that it's prepared to handle scenarios that it actually has not been planned for).

[trivalik]

Additionally I heard of this: https://www.meziantou.net/performance-benefits-of-sealed-class.htm

[jfversluis]

@jonathanpeppers is this something we should consider from a perf standpoint?

[jonathanpeppers]

It would help a very small amount, but if these are internal there is not really a reason not to do it?

[jfversluis]

/azp run MAUI-UITests-public

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