Implement `calc()` in the low-level API (#773) #2483

Job	Run time
Test Suite [no features]	1m 3s
Build [debug feature]	18s
Build Examples	38s
MSRV Build [Rust 1.83]	13s
Test Suite [std + block)]	1m 11s
Test Suite [default features]	1m 5s
Test Suite [default except content_size]	1m 7s
Test Suite [default + serde]	1m 5s
Test Suite [std + flexbox]	1m 14s
Test Suite [std + grid]	1m 9s
Test Suite [std + grid + detailed_layout_info]	1m 10s
Test Suite [std (no algorithms)]	1m 1s
Build Benchmarks	29s
Build Benchmarks (w/ yoga)	44s
Clippy	38s
Documentation	20s
Test Fixture Formatting	29s
Rustfmt	7s
Markdown Lint	3s
Test Suite [alloc + all algorithms]	1m 0s
Test Suite [std + flexbox + detailed_layout_info]	1m 3s
Test Suite [alloc + no algorithms]	59s
	17m 6s

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