Streamlining JS function invocation via reference in Blazor interop

[oroztocil]

As a follow-up to improvements in Blazor JS interop done in #31151, consider adding some API that makes it easier to use an IJSObjectReference that references an JS function. In particular, to be able to convert it into a regular C# Func delegate that can be used to invoke the JS function.

[oroztocil]

There are two open draft PRs with competing approaches to the issue:

• Add statically-typed support for wrapping JS interop calls as C# delegates  #61721
• Add reflection-based support for wrapping JS interop calls as C# delegates #61673