Make the `on` modifier built-in in strict-mode

[NullVoxPopuli]

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Propose making {{on}} a built in modifier

Rendered

Summary

Today, we need

import { on } from '@ember/modifier'`;

This should be built in, and not require an import.

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Upon merging this PR, automation will open a draft PR for this RFC to move to the Ready for Released Stage.

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Checklist to move to Exploring

• [ ] The team believes the concepts described in the RFC should be pursued.
• [ ] The label S-Proposed is removed from the PR and the label S-Exploring is added.
• [ ] The Ember team is willing to work on the proposal to get it to Accepted

Checklist to move to Accepted

• [x] This PR has had the Final Comment Period label has been added to start the FCP
• [x] The RFC is announced in #news-and-announcements in the Ember Discord.
• [x] The RFC has complete prose, is well-specified and ready for implementation.
  • [x] All sections of the RFC are filled out.
  • [x] Any unanswered questions are outlined and expected to be answered before Ready for Release.
  • [x] "How we teach this?" is sufficiently filled out.
• [x] The RFC has a champion within one of the relevant teams.
• [ ] The RFC has consensus after the FCP period.

[Techn1x]

I like this. Seems simple enough, there's already precedent from other modifiers. Isn't really anything new to learn. Could even add a fixable template lint rule to remove unneeded import lines.

[achambers]

Makes sense to me.

[achambers]

RFC Review (1) are in favour of this.

[kategengler]

We decided to move this RFC along with #998, #999, #1000 into FCP to accepted today at the RFC meeting.