Add angualr wrapper generation to CLI

[irfanullahjan]

This PR links gen-wrapper-angular to Lit CLI.

To generate Angular wrappers for the Lit components, we can run:

lit labs gen --framework=angular

This is related to issue: #3300

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[irfanullahjan]

@kevinpschaaf Could you please take a look at this, Sir? Highly appreciated :)

Actually, we need this CLI command and have to keep building a local fork to be able to use it. Thanks!