feat(bob): support custom target definitions #870

Job	Run time
build (macos, legacy-module, kotlin-swift)	2m 16s
build (macos, fabric-view, kotlin-objc)	2m 3s
build (macos, legacy-module, cpp)	2m 15s
build (macos, legacy-module, kotlin-objc)	2m 1s
build (macos, legacy-view, kotlin-swift)	2m 2s
build (macos, legacy-view, kotlin-objc)	1s
build (macos, turbo-module, cpp)	1s
build (macos, turbo-module, kotlin-objc)	1s
build (ubuntu, fabric-view, kotlin-objc)	1m 32s
build (ubuntu, legacy-module, cpp)	1m 42s
build (ubuntu, legacy-module, kotlin-swift)	1m 15s
build (ubuntu, legacy-module, kotlin-objc)	1m 19s
build (ubuntu, legacy-view, kotlin-swift)	1m 40s
build (ubuntu, legacy-view, kotlin-objc)	1m 17s
build (ubuntu, library, js)	1m 52s
build (ubuntu, turbo-module, cpp)	1m 43s
build (ubuntu, turbo-module, kotlin-objc)	1m 32s
	24m 32s

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