Rework topics + syncOp trait #318

Job	Run time
test-api	3m 19s
build-agent (aarch64-unknown-linux-gnu)	6m 46s
build-auth	4m 22s
build-agent (armv7-unknown-linux-gnueabihf)	6m 34s
build-agent (x86_64-unknown-linux-gnu)	6m 45s
build-api	4m 31s
collect-binaries	10s
	32m 27s

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