[WIP] PHP SDK integration #1134

Job	Run time
build-go (ubuntu-latest)	9s
build-dotnet (ubuntu-latest)	25s
build-java (ubuntu-latest)	31s
build-php (ubuntu-latest)	36s
build-python (ubuntu-latest)	21s
build-ts (ubuntu-latest)	20s
feature-tests-python / test	1m 21s
feature-tests-php / test	2m 9s
feature-tests-dotnet / test	1m 23s
feature-tests-go / test	1m 35s
feature-tests-java / test	1m 56s
feature-tests-ts / test	1m 53s
build-docker-images / build-go-docker-images / Build go docker image	2m 28s
build-docker-images / build-dotnet-docker-images / Build cs docker image	1m 47s
build-docker-images / build-java-docker-images / Build java docker image	2m 41s
build-docker-images / build-php-docker-images / Build php docker image	1m 9s
build-docker-images / build-python-docker-images / Build py docker image	2m 20s
build-docker-images / build-ts-docker-images / Build ts docker image	2m 50s
	25m 54s

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