feat: Add support for `builder(required)` #45

Job	Run time
build_docs	40s
no_features (ubuntu, 1.77)	51s
with_features (ubuntu, 1.77, serde)	55s
no_features (ubuntu, stable)	48s
with_features (ubuntu, stable, serde)	50s
no_features (ubuntu, beta)	51s
with_features (ubuntu, beta, serde)	55s
no_features (ubuntu, nightly)	48s
with_features (ubuntu, nightly, serde)	49s
no_features (macos, 1.77)	57s
with_features (macos, 1.77, serde)	3s
no_features (macos, stable)	38s
with_features (macos, stable, serde)	1s
no_features (macos, beta)	46s
with_features (macos, beta, serde)	45s
no_features (macos, nightly)	52s
with_features (macos, nightly, serde)	1s
no_features (windows, 1.77)	1m 30s
no_features (windows, stable)	1m 59s
with_features (windows, 1.77, serde)	45s
no_features (windows, beta)	1m 44s
with_features (windows, stable, serde)	1s
no_features (windows, nightly)	1m 31s
with_features (windows, beta, serde)	47s
	19m 47s

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