ci: add automated fuzz tests #1

Job	Run time
Find fuzz tests / find-tests	6s
syntax/parser: FuzzParser / fuzz	5m 32s
syntax/scanner: FuzzSanitizeIdentifier / fuzz	5m 28s
internal/component/pyroscope/scrape/internal/fastdelta: FuzzDelta / fuzz	5m 25s
syntax/scanner: FuzzScanner / fuzz	5m 24s
	21m 55s

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