added auth.user's git_ssh_keys operations (#719) #1559

Job	Run time
clippy	1m 22s
wasm-build	49s
build (stable, ubuntu)	4m 5s
build (stable, ubuntu, -F stream)	4m 10s
build (stable, macos)	3m 58s
build (stable, macos, -F stream)	3m 23s
build (stable, windows)	9m 30s
build (stable, windows, -F stream)	7m 55s
build (beta, ubuntu)	4m 5s
build (beta, ubuntu, -F stream)	4m 4s
build (beta, macos)	3m 27s
build (beta, macos, -F stream)	3m 26s
build (beta, windows)	7m 56s
build (beta, windows, -F stream)	8m 29s
build (nightly, ubuntu)	3m 16s
build (nightly, ubuntu, -F stream)	3m 16s
build (nightly, macos)	3m 25s
build (nightly, macos, -F stream)	3m 25s
build (nightly, windows)	7m 56s
build (nightly, windows, -F stream)	7m 11s
	1h 35m 8s

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