[Feature] - Consolidate multiple extensions to one assembly

[smaillet]

Is your feature request related to a problem? Please describe.
There are currently a LOT of distinct "extension" libraries in this repo. It's a real PITA to include NuGet references for each one. This applies to all framework extensions. As opposed to some other library extensions. That, is such an extension library itself has NO additional dependency beyond the runtime itself.

Describe the solution you'd like
Consolidate extensions. This at least means merging the InteropHelpers into Ubiquity.NET.Extensions

Describe alternatives you've considered
Leave it as is, consumers can handle the additional effort.

Additional context
Real world use in AOT embedded generator has shown the current design is much harder to use.

[smaillet]

Some of this was performed in PR #336, however there may be more opportunities for consolidation before final release.