[metadata] Move MonoClass:inlinearray_value out of MonoClass

[lambdageek]

inline arrays are quite infrequent. We have the is_inlinearray bit on MonoClass for fast checks, but inlinearray_value doesn't really need to be on every single MonoClass. We should move it to MonoClass:infrequent_data, or at least to MonoClassDef (since generic instances can't change a custom attribute value).

[syfFerdinand]

Hello everyone,
I'm interested in this issue and would like to work on it. Is anyone already on the case, or can I start investigating and propose a solution?

Thank you!

[syfFerdinand]

Hello everyone,

I just saw that @DevPio expressed interest in working on this issue 5 hours ago. If needed, I'm also available and motivated to contribute. We can even collaborate if necessary.

Thank you very much!

[lambdageek]

@DevPio @syfFerdinand we generalliy don't assign issues to community contributors, but if you want to work on it, please open a PR when you have something. If you'd like to discuss the issue, the .NET Discord server https://aka.ms/dotnet-discord has a #monovm channel for Mono-related chat