Support index/length args for string passed to String#bytesplice #4858

Job	Run time
build native	13m 30s
build jvm	6m 24s
lint	14m 8s
ruby/spec on CRuby 3.0	3m 22s
ruby/spec on CRuby 3.1	3m 49s
ruby/spec on CRuby 3.2	2m 57s
test integration	9m 54s
specs :truffle	14m 23s
fast specs	2m 3s
specs :language :core	12m 23s
specs :library :cext :security :command_line :tracepoint	9m 47s
run MRI tests on native	15m 3s
test native	3m 15s
	1h 50m 58s

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