Add support for Guid Dictionary keys in IOptions binding.

[goldsam]

The current options binding implementation only supports the following Dictionary key types:

• integers
• strings
• enums

runtime/src/libraries/Microsoft.Extensions.Configuration.Binder/src/ConfigurationBinder.cs

Lines 617 to 634 in 3875b54

	Type keyType = dictionaryType.GenericTypeArguments[0];
	Type valueType = dictionaryType.GenericTypeArguments[1];
	bool keyTypeIsEnum = keyType.IsEnum;
	bool keyTypeIsInteger =
	keyType == typeof(sbyte) ||
	keyType == typeof(byte) ||
	keyType == typeof(short) ||
	keyType == typeof(ushort) ||
	keyType == typeof(int) ||
	keyType == typeof(uint) ||
	keyType == typeof(long) ||
	keyType == typeof(ulong);
	if (keyType != typeof(string) && !keyTypeIsEnum && !keyTypeIsInteger)
	{
	// We only support string, enum and integer (except nint-IntPtr and nuint-UIntPtr) keys
	return null;
	}

While #36540 would greatly enhance usability by adding extensibility for custom string->key conversions, adding direct support for Guid keys in in the interim would be enormously valuable.

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