Support reading raw extension fields in a MessageSet. (#1755) #1638

# to view logs

Job	Run time
Api Breakage Compared to main branch	0s
swift-format Check	0s
core (6.0.3-noble, SWIFT_BUILD_TEST_HOOK="-Xswiftc -warnings-as-errors", ref/heads/main)	15m 45s
fuzzing_regressions (debug)	3m 43s
core (5.10.1-noble, ref/heads/main)	16m 26s
fuzzing_regressions (release)	3m 7s
sanitizer_testing (address, debug)	2m 41s
sanitizer_testing (address, release)	5m 34s
core (5.9.2-focal, SWIFT_BUILD_TEST_HOOK="-Xswiftc -warnings-as-errors", ref/heads/main)	15m 18s
sanitizer_testing (thread, debug)	2m 51s
core (5.8.1-focal, SWIFT_BUILD_TEST_HOOK="-Xswiftc -warnings-as-errors", ref/heads/main)	14m 51s
sanitizer_testing (thread, release)	4m 55s
	1h 25m 11s

Provide feedback