Separate error type for parse vs `FromStr` #349

Job	Run time
cargo clippy (wasm32)	24s
cargo clippy (windows-latest)	51s
cargo check (msrv) (wasm32)	22s
cargo clippy (macos-latest)	36s
cargo check (msrv) (windows-latest)	46s
cargo clippy (ubuntu-latest)	24s
cargo check (msrv) (macos-latest)	23s
cargo doc	17s
cargo check (msrv) (ubuntu-latest)	15s
formatting	25s
cargo test (windows-latest)	33s
cargo test (wasm32)	17s
cargo test (macos-latest)	20s
typos	6s
cargo test (ubuntu-latest)	21s
	6m 20s

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