dev: Ensure Ads and Common Protos new component parameters are derived correctly

[bshaffer]

We have a command which builds new components from proto files and calculates their parameters based on the protos provided:

./dev/google-cloud component:new

However, when a component has the namespace Google\Ads, custom parameters must be provided in order to configure the appropriate composer package name and github repository:

• The composer package name should use googleapis as the vendor instead of google, e.g. googleads/[project-name] instead of google/[project-name]
• The github repo should be googleapis/php-ads-[project-name]

The same is true for CommonProtos libraries - if no GAPIC clients exist, we append CommonProtos to the component name, and -common-protos to the package and repo names.

See go/cloud-sdk-php-new-component-heuristics