Deprecate old transport API for removal in next release #358

Job	Run time
test / Build project on ubuntu-latest	11m 30s
test / Build project on macos-latest	50m 44s
test / Build project on windows-latest	20m 37s
test / run-tests (ubuntu-latest, jvm)	4m 29s
test / run-tests (ubuntu-latest, jvm11)	4m 48s
test / run-tests (ubuntu-latest, jvm17)	4m 7s
test / run-tests (ubuntu-latest, jvm21)	4m 21s
test / run-tests (ubuntu-latest, js)	3m 29s
test / run-tests (ubuntu-latest, native)	5m 20s
test / run-tests (macos-latest, macos)	6m 9s
test / run-tests (macos-latest, ios)	10m 46s
test / run-tests (macos-latest, watchos)	11m 16s
test / run-tests (macos-latest, tvos)	13m 28s
test / run-tests (windows-latest, native)	7m 23s
test / Publish test report	13s
	2h 38m 40s

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