Moves FastResourceComparer and TaskAwaiter to shared (dotnet/coreclr#18283)

Moves FastResourceComparer and TaskAwaiter to shared (dotnet/coreclr#18283)

* Reduces diff in BinaryReader

* Moves FastResourceComparer to shared

* Reduces diff in FileBasedResourceGroveler

* Minor comment diff in ManifestBasedResourceGroveler

* Reducing diff by removing extra blank lines in ResourceReader

* Reduces diff by renaming private fields in AssemblyName

* String to string and Object to object in AssemblyName

* Reduces diff in TaskAwaiter

* Moves TaskAwaiter to shared

* Apply code review feedback

* Fixes failure in corert

* Revert Renaming fields in AssemblyName

Commit migrated from https://github.com/dotnet/coreclr/commit/39da0af098b86b55e44bd1e42fefb2b2b6a8ab67