Added backend control plane implementation #1857

Job	Run time
Check src clang-format conformance	26s
Check codespell conformance	13s
Check tests clang-format conformance	16s
Check Docker image (Debug)	50m 14s
Build Debug with g++-11	2m 2s
Check Docker image (Release)	49m 47s
Build Debug with clang-13	2m 30s
Build Debug with g++-12	2m 19s
Build Debug with clang-16	2m 20s
Build Debug with g++-10	2m 35s
Build Debug with clang-17	5m 41s
Build Release with g++-13	2m 21s
Build Debug with clang-15	2m 7s
Build Release with clang-14	2m 24s
Build Release with g++-12	2m 25s
Build Release with g++-10	2m 25s
Build Debug with clang-14	2m 3s
Build Release with clang-15	3m 4s
Build Release with clang-17	2m 28s
Build Release with clang-13	2m 36s
Build Debug with g++-9	1m 51s
Build Release with g++-11	2m 29s
Build Release with g++-9	2m 15s
Build Debug with clang-18	2m 15s
Build Debug with g++-13	2m 18s
Build Release with clang-18	2m 21s
Build Release with clang-16	2m 30s
Codecov report upload	0s
	2h 36m 15s

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