Add transcript feature #1624

Job	Run time
get_available_profiles	9s
update_client_pr (android-uploader, api.video-android-uploader)	45s
close_client_pr	0s
merge_client_pr	0s
update_client_pr (android, api.video-android-client)	1m 22s
update_client_pr (csharp, api.video-csharp-client)	37s
update_client_pr (go, api.video-go-client)	32s
update_client_pr (java, api.video-java-client)	3m 27s
update_client_pr (nodejs, api.video-nodejs-client)	57s
update_client_pr (php, api.video-php-client)	31s
update_client_pr (python, api.video-python-client)	34s
update_client_pr (swift5-uploader, api.video-swift-uploader)	29s
update_client_pr (swift5, api.video-swift-client)	28s
generate_documentation	0s
	9m 51s

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