Remove allcation in `parse_identifier` (#12103) #213

Job	Run time
Determine changes	9s
pre-commit	35s
cargo fmt	18s
mkdocs	2m 12s
python package	1m 8s
cargo clippy	1m 34s
cargo build (release)	3m 56s
benchmarks	0s
cargo build (msrv)	2m 48s
cargo fuzz	4m 15s
cargo shear	23s
cargo test (linux)	3m 11s
cargo test (wasm)	1m 8s
cargo test (windows)	9m 11s
formatter instabilities and black similarity	3m 46s
test scripts	53s
test ruff-lsp	25s
Fuzz the parser	5m 23s
ecosystem	0s
	41m 15s

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