Fix performance regression on large `.feature` files (#352, #331) #828

Job	Run time
clippy	43s
feature (<none>)	35s
MSRV (1.83.0, cucumber-codegen, ubuntu)	1m 2s
feature (macros)	44s
rustdoc (cucumber-codegen)	22s
MSRV (1.83.0, cucumber-codegen, macOS)	1m 11s
feature (timestamps)	34s
rustdoc (cucumber)	54s
MSRV (1.83.0, cucumber-codegen, windows)	2m 20s
rustfmt	12s
feature (output-json)	42s
MSRV (1.83.0, cucumber, ubuntu)	2m 57s
feature (output-junit)	1m 1s
feature (libtest)	44s
MSRV (1.83.0, cucumber, macOS)	2m 45s
MSRV (1.83.0, cucumber, windows)	4m 32s
feature (tracing)	32s
test (Book, ubuntu)	4m 57s
test (cucumber-codegen, stable, ubuntu)	45s
test (Book, macOS)	4m 59s
test (cucumber-codegen, stable, macOS)	40s
test (Book, windows)	7m 0s
test (cucumber-codegen, stable, windows)	2m 41s
test (cucumber-codegen, beta, ubuntu)	51s
test (cucumber-codegen, beta, macOS)	49s
test (cucumber-codegen, beta, windows)	1m 36s
test (cucumber-codegen, nightly, ubuntu)	1m 22s
test (cucumber-codegen, nightly, macOS)	1m 16s
test (cucumber-codegen, nightly, windows)	2m 36s
test (cucumber, stable, ubuntu)	3m 2s
test (cucumber, stable, macOS)	2m 41s
test (cucumber, stable, windows)	5m 6s
test (cucumber, beta, ubuntu)	2m 54s
test (cucumber, beta, macOS)	2m 56s
test (cucumber, beta, windows)	4m 33s
test (cucumber, nightly, ubuntu)	3m 22s
test (cucumber, nightly, macOS)	3m 11s
test (cucumber, nightly, windows)	5m 30s
deploy (Book)	8s
pr	0s
release (GitHub)	0s
publish (crates.io)	0s
	1h 24m 45s

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