[GR-59866] Implement ObjectSpace::WeakKeyMap #5127

Job	Run time
build native	9m 16s
ruby/spec on CRuby 3.0	3m 34s
build jvm	6m 22s
lint	5m 1s
ruby/spec on CRuby 3.1	3m 27s
ruby/spec on CRuby 3.2	3m 17s
fast specs	1m 45s
test integration	9m 53s
specs :truffle	15m 4s
specs :language :core	12m 50s
specs :library :cext :security :command_line :tracepoint	9m 54s
test native	0s
run MRI tests on native	0s
	1h 20m 23s

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