[native_assets_builder] Refactor API to `ProtocolExtension`s #1574

Job	Run time
health / coverage	0s
health / breaking / run breaking health check	1m 4s
health / changelog / run changelog health check	1m 13s
health / do-not-submit / run do-not-submit health check	1m 6s
health / leaking / run leaking health check	1m 9s
health / license / run license health check	1m 8s
health / comment	5s
	5m 45s

Provide feedback