fix: Many Stride build warnings

[ds5678]

PR Details

When building Stride, thousands of warnings are generated. This pull request addresses many of the ones unrelated to nullability. Notably:

• Method calls taking a typeof parameter were replaced with their generic overload, if available.
• Calls to Read were replaced with ReadExactly.
• Some synchronous calls were replaced with asynchronous alternatives.
• General xUnit assert calls were replaced with more specific ones.
• Two static constructors were removed since they only initialized fields.
• SymbolEqualityComparer.Default is now used to compare assemblies.
• I implemented PendingPackageUpgrade::GetHashCode to align behavior with Equals.

Related Issue

The use of generic overloads will help with trimming and NativeAOT (#2069).

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My change requires a change to the documentation.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have built and run the editor to try this change out.

[ds5678]

Can this be merged?