added user's social accounts operations (/user/social_accounts) (#723) #1563

Job	Run time
wasm-build	46s
clippy	1m 33s
build (stable, ubuntu)	4m 26s
build (stable, ubuntu, -F stream)	4m 10s
build (stable, macos)	3m 27s
build (stable, macos, -F stream)	3m 26s
build (stable, windows)	9m 24s
build (stable, windows, -F stream)	9m 12s
build (beta, ubuntu)	4m 19s
build (beta, ubuntu, -F stream)	4m 9s
build (beta, macos)	4m 33s
build (beta, macos, -F stream)	3m 16s
build (beta, windows)	7m 37s
build (beta, windows, -F stream)	7m 48s
build (nightly, ubuntu)	3m 18s
build (nightly, ubuntu, -F stream)	3m 20s
build (nightly, macos)	3m 16s
build (nightly, macos, -F stream)	4m 32s
build (nightly, windows)	7m 42s
build (nightly, windows, -F stream)	7m 34s
	1h 37m 48s

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