feat: add experimental annotation #5487

Job	Run time
check_format_and_unit_tests	1m 27s
build / Special integration tests (21)	1m 52s
build / Special integration tests (17)	2m 3s
build / Special integration tests (24)	2m 5s
build / httpclient-tests (jdk) / Integration tests (24, 1.32.0, jdk)	23m 13s
build / httpclient-tests (vertx) / Integration tests (24, 1.32.0, vertx)	23m 44s
build / httpclient-tests (jetty) / Integration tests (24, 1.32.0, jetty)	23m 23s
build / integration_tests (24, 1.31.8) / Integration tests (24, 1.31.8, vertx)	23m 55s
build / integration_tests (21, 1.32.4) / Integration tests (21, 1.32.4, vertx)	23m 4s
build / integration_tests (24, 1.33.1) / Integration tests (24, 1.33.1, vertx)	24m 21s
build / integration_tests (17, 1.32.4) / Integration tests (17, 1.32.4, vertx)	23m 40s
build / integration_tests (21, 1.33.1) / Integration tests (21, 1.33.1, vertx)	23m 33s
build / integration_tests (24, 1.30.12) / Integration tests (24, 1.30.12, vertx)	22m 6s
build / integration_tests (24, 1.32.4) / Integration tests (24, 1.32.4, vertx)	24m 4s
build / integration_tests (17, 1.30.12) / Integration tests (17, 1.30.12, vertx)	22m 31s
build / integration_tests (17, 1.33.1) / Integration tests (17, 1.33.1, vertx)	24m 18s
build / integration_tests (17, 1.31.8) / Integration tests (17, 1.31.8, vertx)	23m 51s
build / integration_tests (21, 1.31.8) / Integration tests (21, 1.31.8, vertx)	24m 18s
build / integration_tests (21, 1.30.12) / Integration tests (21, 1.30.12, vertx)	22m 18s
	5h 59m 46s

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