Refactor: arrange lints in misc_early module

[TaKO8Ki]

This PR arranges misc_early lints so that they can be accessed more easily.
Basically, I refactored them following the instruction described in #6680.

cc: @Y-Nak, @flip1995, @magurotuna

changelog: Move lints in misc_early module into their own modules.

[rust-highfive]

r? @llogiq

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[llogiq]

Thank you!

@bors r+

[bors]

📌 Commit 3fbb060 has been approved by llogiq

[bors]

⌛ Testing commit 3fbb060 with merge 7191675...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: llogiq
Pushing 7191675 to master...

[flip1995]

Thanks for splitting up those lints! This will need a follow up PR though. The main issue with the misc and misc_early modules was that they combine multiple unrelated lints. Those lints should be integrated in existing other lint passes or get their own lint passes. For example the MIXED_CASE_HEX_LITERALS lint would fit into the literal_representation.rs module. The end goal would be to get rid of the misc_early and misc modules completely.

[TaKO8Ki]

@flip1995
Sure! I'm going to open a new tracking issue about that and work on it.

[flip1995]

Thanks! If you're unsure about lints, just ask or put them where you see the best fit for them and we can look at it during review.