CA2021 does not detect suspicious type casts on ImmutableArray (and others)

### Describe the bug
CA2021 only considers extension methods specifically on the IEnumerable type for suspicious use of OfType/Cast. This is probably too permissive.

### To Reproduce
`Array.Empty().OfType()` will produce CA2021.

`ImmutableArray.Empty.OfType()` will not.

### Further technical details
ImmutableArray directly implements OfType (and many other linq methods). Presumably other types in the wild do also.

The analyzer [does not consider](https://github.com/dotnet/sdk/blob/f49821513314459df88302142d6fe1aabbb5e9e9/src/Microsoft.CodeAnalysis.NetAnalyzers/src/Microsoft.CodeAnalysis.NetAnalyzers/Microsoft.NetCore.Analyzers/Runtime/DoNotCallEnumerableCastOrOfTypeWithIncompatibleTypesAnalyzer.cs#L68-L79
) types providing more specific implementations that likely have the same semantics.

The analyzer at minimum should whitelist framework types to be included in the check, and I would lightly argue that semantic equivalence should be assumed of any "linqy" method with these names.