improve: add license headers to source files #5605

Job	Run time
check_format_and_unit_tests	2m 29s
build / Special integration tests (17)	2m 21s
build / Special integration tests (21)	2m 54s
build / Special integration tests (24)	2m 36s
build / integration_tests (17, 1.31.8) / Integration tests (17, 1.31.8, vertx)	24m 8s
build / integration_tests (17, 1.32.4) / Integration tests (17, 1.32.4, vertx)	23m 25s
build / integration_tests (24, 1.30.12) / Integration tests (24, 1.30.12, vertx)	22m 33s
build / integration_tests (17, 1.30.12) / Integration tests (17, 1.30.12, vertx)	22m 48s
build / integration_tests (17, 1.33.1) / Integration tests (17, 1.33.1, vertx)	24m 47s
build / integration_tests (21, 1.31.8) / Integration tests (21, 1.31.8, vertx)	23m 44s
build / integration_tests (24, 1.31.8) / Integration tests (24, 1.31.8, vertx)	23m 16s
build / integration_tests (24, 1.32.4) / Integration tests (24, 1.32.4, vertx)	23m 24s
build / integration_tests (21, 1.30.12) / Integration tests (21, 1.30.12, vertx)	22m 30s
build / httpclient-tests (jetty) / Integration tests (24, 1.32.0, jetty)	23m 52s
build / integration_tests (21, 1.32.4) / Integration tests (21, 1.32.4, vertx)	24m 30s
build / integration_tests (21, 1.33.1) / Integration tests (21, 1.33.1, vertx)	25m 9s
build / httpclient-tests (vertx) / Integration tests (24, 1.32.0, vertx)	24m 7s
build / httpclient-tests (jdk) / Integration tests (24, 1.32.0, jdk)	23m 18s
build / integration_tests (24, 1.33.1) / Integration tests (24, 1.33.1, vertx)	23m 51s
	6h 5m 42s

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