Add TypeScript HTTP proxy feature #954

Job	Run time
build-ts (ubuntu-latest)	6s
build-dotnet (ubuntu-latest)	24s
build-java (ubuntu-latest)	27s
build-go (ubuntu-latest)	30s
build-python (ubuntu-latest)	24s
latest-sdk-versions	1s
feature-tests-python / test	6m 18s
feature-tests-dotnet / test	47s
feature-tests-go / test	2m 7s
feature-tests-java / test	2m 8s
feature-tests-ts / test	50s
build-docker-images / build-go-docker-images / Build go docker image	4m 59s
build-docker-images / build-java-docker-images / Build java docker image	5m 10s
build-docker-images / build-dotnet-docker-images / Build cs docker image	1m 45s
build-docker-images / build-python-docker-images / Build py docker image	3m 42s
build-docker-images / build-ts-docker-images / Build ts docker image	2m 5s
	31m 43s

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