Ruby

Add `ruby-rbs` crate: Safe Rust wrapper over `ruby-rbs-sys` #7707

Job	Run time
C99_compile (head)	2m 1s
C99_compile (4.0)	1m 16s
test (4.0, test)	2m 51s
test (3.2, test)	2m 46s
test (head, stdlib_test rubocop)	3m 2s
test (4.0, stdlib_test)	1m 56s
test (head, test)	3m 46s
test (3.4, test)	2m 59s
test (4.0, rubocop validate test_doc build test_generate_stdlib raap)	2m 52s
test (4.0, stdlib_test, --enable-frozen-string-literal)	1m 57s
test (4.0, test, --enable-frozen-string-literal)	2m 58s
test (4.0, typecheck_test)	1m 4s
test (3.3, test)	3m 15s
	32m 43s

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