feat: add gherkin doc string support #585

Job	Run time
Linux Host Build	3m 51s
Windows Host Build	6m 47s
Linux Host Build in Devcontainer	4m 12s
Linux Host Test	4m 3s
Host Build & Test (macos-latest)	5m 18s
Host Build & Test (windows-latest)	7m 53s
	32m 4s

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