Experiment: Use rayon when resolving glyphs #1935

Job	Run time
cargo check (msrv) (wasm32)	35s
cargo check (msrv) (windows-latest)	1m 16s
cargo check (aarch64-android)	21s
cargo clippy (windows-latest)	2m 33s
cargo check (msrv) (macos-latest)	36s
cargo clippy (macos-latest)	1m 1s
cargo clippy (wasm32)	1m 19s
cargo check (msrv) (ubuntu-latest)	47s
cargo doc	1m 42s
cargo clippy (ubuntu-latest)	1m 22s
formatting	29s
Prime LFS Cache	7s
typos	10s
cargo test (wasm32)	30s
cargo test (windows-latest)	2m 23s
cargo test (macos-latest)	1m 11s
cargo test (ubuntu-latest)	3m 40s
	20m 2s

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