"Traitify" the `Style` struct #2254

Job	Run time
Build Benchmarks	30s
Build Benchmarks (w/ yoga)	48s
Clippy	29s
Documentation	26s
Test Fixture Formatting	11s
Rustfmt	8s
Markdown Lint	4s
Test Suite [alloc + all algorithms]	1m 33s
Test Suite [std + block)]	13s
Build [debug feature]	12s
Test Suite [default features]	1m 34s
Test Suite [default except content_size]	1m 30s
Test Suite [default + serde]	1m 39s
Test Suite [std + flexbox]	21s
Test Suite [std + grid]	14s
Test Suite [alloc + no algorithms]	6s
MSRV Build [Rust 1.65]	1m 47s
Test Suite [std (no algorithms)]	12s
Test Suite [no features]	6s
	12m 3s

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