Experiment: Use rayon when resolving glyphs #1931

Job	Run time
cargo check (msrv) (wasm32)	38s
cargo check (msrv) (windows-latest)	2m 2s
cargo check (aarch64-android)	20s
cargo check (msrv) (macos-latest)	41s
cargo clippy (windows-latest)	2m 32s
cargo check (msrv) (ubuntu-latest)	48s
cargo clippy (macos-latest)	1m 1s
cargo clippy (wasm32)	1m 22s
cargo clippy (ubuntu-latest)	1m 30s
cargo doc	27s
formatting	22s
Prime LFS Cache	5s
cargo test (wasm32)	27s
typos	7s
cargo test (windows-latest)	2m 12s
cargo test (macos-latest)	1m 13s
cargo test (ubuntu-latest)	3m 36s
	19m 23s

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