feat: add Valid() method to generated enum types #90

Job	Run time
build-binaries (stable)	18s
build-binaries (oldstable)	11s
build / Setup	2s
build / Lint (1.25)	2m 54s
build / Build (1.23)	1m 16s
build / Build (1.24)	1m 5s
build / Build (1.22)	1m 2s
build / Generated files (1.25)	36s
build / Build (oldstable)	1m 1s
build / Generated files (1.24)	27s
build / Generated files (oldstable)	35s
build / Build (1.25)	1m 5s
build / Go mod tidy (1.24)	17s
build / Generated files (1.22)	49s
build / Go mod tidy (1.22)	19s
build / Build (stable)	1m 17s
build / Go mod tidy (oldstable)	13s
build / Generated files (stable)	34s
build / Go mod tidy (1.25)	14s
build / Go mod tidy (1.23)	15s
build / Go mod tidy (stable)	16s
build / Generated files (1.23)	51s
build / CI	2s
	15m 39s

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