[4.x] Add !Transform and !GetStackOutput short forms - #451
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!Transform and !GetStackOutput short forms
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AWS documents YAML short forms for
Fn::TransformandFn::GetStackOutput, but the shared CloudFormation schema only registers the seventeen tags upstream knows about, so!Transformand!GetStackOutputfail with an unknown tag error everywhere osls parses YAML, from aresourcesblock to an existing stack's template on the deployment bucket repair path. This adds both names to the function list, which the existing type factory maps to theirFn::keys, records the addition in the utils README divergence note so it survives a re-sync, and covers both short forms in the schema test.Fn::Length,Fn::ToJsonStringand the Rules functions have no documented short forms and are deliberately left out. #452 applies the same change to 3.x. Fixes #450.