test

Refactoring to extract Lrama::Grammar::Symbols #1106

Job	Run time
check-misc (head)	12s
steep-check (head)	17s
test-memory (head)	25s
test-windows (head)	2m 15s
test-ruby (head, master)	5m 10s
test-ruby (3.0, master)	5m 45s
test-ruby (2.7, master)	5m 12s
ruby-versions / Generate Ruby versions	3s
test (2.5)	21s
test (2.6)	28s
test (2.7)	26s
test (3.0)	11s
test (3.1)	13s
test (3.2)	13s
test (3.3)	13s
test (head)	14s
	21m 38s

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