feat(ng-dev): integrate AI tooling into ng-dev

[crisbeto]

Integrates the AI tooling prototype into ng-dev.

[josephperrott]

Overall LGTM

We may need to allow users to provide the auth key via an input flag as some team members prefer not to store keys like this as a env variable, but we can also wait until we actually have that feedback.

Just a few little comments to look at and we can try to get it merged in.

[crisbeto]

@josephperrott I've addressed the feedback. I've also added the option to pass the API key as a flag, rather than using the environment variable.

[josephperrott]

This PR was merged into the repository by commit b3127a1.

The changes were merged into the following branches: main

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