test

Refactoring to extract Lrama::Grammar::Symbols #1094

Job	Run time
check-misc (head)	11s
steep-check (head)	15s
test-memory (head)	24s
test-ruby (head, master)	5m 9s
test-ruby (3.0, master)	5m 2s
test-windows (head)	1m 46s
test-ruby (2.7, master)	5m 22s
ruby-versions / Generate Ruby versions	3s
test (2.5)	20s
test (2.6)	27s
test (2.7)	21s
test (3.0)	13s
test (3.1)	11s
test (3.2)	12s
test (3.3)	9s
test (head)	10s
	20m 15s

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