feat(angular): omit output related imports for components with no event

[KariiO]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally for affected output targets
• Tests (npm test) were run locally and passed
• Prettier (npm run prettier) was run locally and passed

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

It will always add EventEmitter and proxyOutputs imports event if there are no components with event.

Issue URL: Resolves #331

What is the new behavior?

Include import EventEmitter and proxyOutputs only if there is at least one component with event.

Does this introduce a breaking change?

• Yes
• No

Other information

[liamdebeasi]

Thanks for the PR! Is there an open issue on GitHub that you can link this to?

[KariiO]

Unfortunately there is no issue for that - if its required I'll create one.

[liamdebeasi]

Yes, please create one. We require PRs to be linked to triaged issues before they can be merged. Thanks!

[KariiO]

Yes, please create one. We require PRs to be linked to triaged issues before they can be merged. Thanks!

Done - issue is created and linked.

[JessicaSachs]

LGTM but would love another set of eyes on it from someone who knows Angular a bit better.

[liamdebeasi]

@sean-perkins Mind taking a look when you get a chance?

[sean-perkins]

This looks good to me, thanks for this contribution and great work 🎉