feat(bob): support custom target definitions #863

Job	Run time
build (macos, fabric-view, kotlin-objc)	3m 2s
build (macos, legacy-module, cpp)	5m 5s
build (macos, legacy-module, kotlin-objc)	2m 51s
build (macos, legacy-module, kotlin-swift)	3m 14s
build (macos, legacy-view, kotlin-swift)	9m 22s
build (macos, legacy-view, kotlin-objc)	3m 6s
build (macos, turbo-module, cpp)	2m 49s
build (macos, turbo-module, kotlin-objc)	3m 3s
build (ubuntu, fabric-view, kotlin-objc)	1m 49s
build (ubuntu, legacy-module, cpp)	1m 18s
build (ubuntu, legacy-module, kotlin-swift)	1m 14s
build (ubuntu, legacy-module, kotlin-objc)	1m 18s
build (ubuntu, legacy-view, kotlin-swift)	1m 35s
build (ubuntu, legacy-view, kotlin-objc)	1m 32s
build (ubuntu, turbo-module, cpp)	1m 19s
build (ubuntu, library, js)	1m 36s
build (ubuntu, turbo-module, kotlin-objc)	1m 23s
	45m 36s

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