[src] Improve generics support.

[rolfbjarne]

Relax certain generic constraints:

• Make NSEnumerator<TKey> able to iterate over any INativeObject, it doesn't have to be a class. This is required so that we can declare APIs that iterate over protocols:

  public NSEnumerator<ISomeProtocol> GetEnumerator ();

• Make Runtime.GetINativeObject<T> able to return any INativeObject, it doesn't have to be a class. This is required so that we can declare generic APIs over protocols:

  [BaseType (typeof (NSObject))]
  interface GenericCollection<Key, Element>
  	where Key : NSString
  	where Element : ISomeProtocol {
  
  	[Export ("getElement:"), NullAllowed]
  	Element GetElement (Key key);
  }
  
  [Protocol]
  interface ProtocolWithGenericCollection {
  	[Export ("first", ArgumentSemantic.Retain)]
  	VeryGenericCollection<NSString, ISomeOtherProtocol> Collection { get; }
  }

  the problem is the Collection property, ideally we'd like to use a combined generic constraint to constrain it to classes, something like this:

  VeryGenericCollection<NSString, {class, ISomeOtherProtocol}> Collection { get; }

  but this isn't possible in C#, thus we have to relax the generic constraints elsewhere.

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• tvOS: vsdrops gist ( No breaking changes )
• MacCatalyst: vsdrops gist ( No breaking changes )
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✅ API diff vs stable

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• iOS: vsdrops gist ( No breaking changes )
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✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
✅ framework: All 2 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. Html Report (VSDrops) Download
✅ generator: All 5 tests passed. Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 4 tests passed. Html Report (VSDrops) Download
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 8 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 15 tests passed. [attempt 2] Html Report (VSDrops) Download
✅ monotouch (macOS): All 9 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 10 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ windows: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

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