Add a simple test for the new AWS::LanguageExtensions transform

[michael-k]

See https://aws.amazon.com/about-aws/whats-new/2022/09/aws-cloudformation-new-language-extensions-transform/

I've take the example from https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-languageextension-transform.html to see if that works.

At least the combination of AWS::LanguageExtensions with the AWS::Serverless transform and globals needs a bit of work. The globals checks don't work with multiple transforms.

troposphere/troposphere/__init__.py

Lines 834 to 850 in 759496c

	def set_transform(self, transform: Union[List[object], str]) -> None:
	from troposphere.serverless import SERVERLESS_TRANSFORM
	if self.globals and transform != SERVERLESS_TRANSFORM:
	raise ValueError(
	"Cannot set transform to non-Serverless while using Globals"
	)
	self.transform = transform
	def set_globals(self, globals: Globals) -> None:
	from troposphere.serverless import SERVERLESS_TRANSFORM
	if self.transform != SERVERLESS_TRANSFORM:
	raise ValueError(
	f"Cannot set Globals for non-Serverless template (set transform to '{SERVERLESS_TRANSFORM}' first)"
	)
	self.globals = globals

[michael-k]

The tests passed locally.

The failing spec test is a bit annoying. I've looked into it, but spent most of my available time understanding the code.

[markpeek]

Thanks!