Move CompactLength into it's own module #2497

Job	Run time
Build [debug feature]	14s
MSRV Build [Rust 1.65]	1m 38s
Clippy	37s
Build Examples	42s
Rustfmt	25s
Test Suite [alloc + all algorithms]	1m 6s
Test Suite [std + block)]	1m 6s
Test Suite [default features]	1m 1s
Test Suite [default except content_size]	1m 2s
Test Suite [default + serde]	1m 6s
Test Suite [std + flexbox]	1m 2s
Test Suite [std + flexbox + detailed_layout_info]	1m 7s
Test Suite [std + grid]	1m 4s
Test Suite [alloc + no algorithms]	1m 5s
Test Suite [std + grid + detailed_layout_info]	1m 8s
Test Suite [std (no algorithms)]	1m 1s
Test Suite [no features]	1m 5s
Build Benchmarks	37s
Documentation	18s
Build Benchmarks (w/ yoga)	51s
Markdown Lint	3s
Test Fixture Formatting	10s
	18m 28s

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