Auto-generate lint pass registration

[Jarcho]

Based on #16664

This technically introduces some constraints on how parts of each lint pass has to be declared, but this isn't restrictive in practice. Lint registration and explain have been moved out of clippy_lints into clippy-driver and cargo-clippy in preparation for splitting clippy_lints. The rest will be moved out in a separate PR.

changelog: none

[rustbot]

Some changes occurred in clippy_lints/src/doc

cc @notriddle

[rustbot]

r? @llogiq

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[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[rustbot]

☔ The latest upstream changes (possibly #17644) made this pull request unmergeable. Please resolve the merge conflicts.