[src] Throw an exception if entering methods that aren't supported with NativeAOT.

[rolfbjarne]

We have numerous methods that we should never end up executing when using
NativeAOT, in particular methods called from native code.

Ideally we'd be able to link these away completely, but that's a much larger
refactoring, so in the meantime we can do something simpler: just throw an
exception in these methods if using NativeAOT.

There are two advantages:

• Smaller apps.
• No warnings from NativeAOT about these methods doing things that aren't
  trimmer-safe.

Contributes towards #18629.

[rolfbjarne]

This depends on #18905 to be merged first.

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• xamarin.ios-16.5.0.848.pkg
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✅ API diff vs stable

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• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• watchOS: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

.NET (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

Legacy Xamarin (stable) vs .NET

• iOS: vsdrops gist
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