feat(gapic-generator-java): Extract resource name heuristicly #268

Job	Run time
filter	57s
build(8) except for gapic-generator-java	1m 4s
build(8) for showcase	56s
build(25) except self-service clients	1m 1s
build(8) for gapic-generator-java	55s
unmanaged_dependency_check	5m 26s
showcase-clirr	4m 8s
build(21) except self-service clients	52s
build (17)	54s
dependency_analyzer_unit_test	1m 21s
showcase (25)	56s
showcase (17)	56s
showcase (11)	54s
showcase (21)	53s
gapic-generator-java-bom	1m 11s
build (11)	54s
	23m 18s

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