generate-api: print component versions (googleapis#3552)

Release 0.56.0 (googleapis#3521)

Release 0.55.1 (googleapis#3489)

Release 0.55.0 (googleapis#3485)

Release 0.54.0 (googleapis#3457)

Release 0.53.0 (googleapis#3399)

Release 0.52.0 (googleapis#3376)

Release 0.51.0 (googleapis#3358)

Release 0.50.0 (googleapis#3337)

* Also add texttospeech v1 to versions.txt

release 0.49.0 (googleapis#3310)