Support Time.new with string timestamp argument and error when invalid #4959

Job	Run time
build jvm	6m 37s
build native	13m 40s
lint	13m 53s
ruby/spec on CRuby 3.0	3m 28s
ruby/spec on CRuby 3.1	3m 32s
ruby/spec on CRuby 3.2	2m 59s
test integration	9m 35s
specs :truffle	14m 25s
fast specs	2m 5s
specs :language :core	12m 26s
specs :library :cext :security :command_line :tracepoint	9m 28s
run MRI tests on native	16m 14s
test native	3m 20s
	1h 51m 42s

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