RFC: Document Clippy's teams and team duties
First the big announcement:
**We want to add a new subteam for regular contributors to give them triage rights.**
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This PR adds a new section to the book which describes the Clippy and Clippy-Contributor teams, with their duties and membership requirements. This is just an initial draft, that outlines what, I think, their responsibilities should be.
I hope everyone in the team is okay with me posting this directly to GitHub. I think a PR makes collaboration a bit easier.
[🖼️ Rendered 🖼️](https://github.com/xFrednet/rust-clippy/blob/add-team-docs/book/src/development/the_team.md)
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Once we've decided on this document, I'll create a PR to add the new team on GitHub. As part of this, we'll also reach out to some active contributors, to ask if they would like to join the new team.
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cc: `@rust-lang/clippy`
cc: #6627
changelog: none
r? `@flip1995`
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