Add API to expose computed grid information #2458

Job	Run time
Build Benchmarks	44s
Build Benchmarks (w/ yoga)	55s
Build Examples	44s
Build [debug feature]	22s
MSRV Build [Rust 1.65]	1m 14s
Documentation	19s
Clippy	33s
Test Fixture Formatting	22s
Rustfmt	13s
Markdown Lint	6s
Test Suite [alloc + all algorithms]	1m 12s
Test Suite [std + block)]	1m 14s
Test Suite [default features]	51s
Test Suite [default except content_size]	1m 6s
Test Suite [default + serde]	57s
Test Suite [std + flexbox]	1m 2s
Test Suite [std + grid]	53s
Test Suite [alloc + no algorithms]	54s
Test Suite [std (no algorithms)]	50s
Test Suite [no features]	1m 7s
	15m 38s

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