Refactor rate limiter and improve rate limit bucket cleanup (#3937)

* Update rate_limiter.rs

* Update mod.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update mod.rs

* Update scheduled_tasks.rs

* Shrink `RateLimitBucket`

* Update rate_limiter.rs

* Update mod.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update mod.rs

* Update rate_limiter.rs

* fmt

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* Update rate_limiter.rs

* rerun ci

* Update rate_limiter.rs

* Undo changes to  fields

* Manually undo changes to RateLimitBucket fields

* fmt

* Bucket cleanup loop in rate_limit/mod.rs

* Remove rate limit bucket cleanup from scheduled_tasks.rs

* Remove ;

* Remove UNINITIALIZED_TOKEN_AMOUNT

* Update rate_limiter.rs

* fmt

* Update rate_limiter.rs

* fmt

* Update rate_limiter.rs

* fmt

* Update rate_limiter.rs

* stuff

* MapLevel trait

* fix merge

* Prevent negative numbers in buckets

* Clean up MapLevel::check

* MapLevel::remove_full_buckets

* stuff

* Use remove_full_buckets to avoid allocations

* stuff

* remove tx

* Remove RateLimitConfig

* Rename settings_updated_channel to rate_limit_cell

* Remove global rate limit cell

* impl Default for RateLimitCell

* bucket_configs doc comment to explain EnumMap

* improve test_rate_limiter

* rename default to with_test_config

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Co-authored-by: Dessalines <dessalines@users.noreply.github.com>
Co-authored-by: Nutomic <me@nutomic.com>