Adds support for optional mapping #389

Job	Run time
Swift tests (swift:6.0.2 jdk:Corretto os:jammy)	4m 11s
Java tests (swift:6.0.2 jdk:Corretto os:jammy)	7m 40s
Verify Samples (swift:6.0.2 jdk:Corretto os:jammy)	10m 39s
soundness / Broken symlinks check	4s
soundness / API breakage check	0s
soundness / Format check	0s
soundness / Documentation check	37s
soundness / License headers check	4s
soundness / Python lint check	6s
soundness / Unacceptable language check	2s
soundness / Shell check	35s
soundness / YAML lint check	4s
	24m 2s

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