Implement register-based closure ctx #1704

Job	Run time
setup	5s
populate-linux-sysroot	4s
build	7m 46s
test-artifacts (macos-latest, darwin, arm64, 1.24.2, 1.24)	2m 59s
test-artifacts (macos-15-intel, darwin, amd64, 1.24.2, 1.24)	8m 12s
test-artifacts (ubuntu-24.04-arm, linux, arm64, 1.24.2, 1.24)	1m 49s
test-artifacts (ubuntu-latest, linux, amd64, 1.24.2, 1.24)	1m 34s
release	0s
	22m 29s

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