userspace: proxy: Introduce user worker to service IPC #883

Job	Run time
build-windows (mtl lnl)	12m 38s
build-windows (tgl tgl-h)	10m 36s
build-windows (-d, lnl)	9m 55s
build-windows (imx8 imx8x imx8m imx8ulp)	13m 22s
manifest-check	3m 25s
LP64-WIP	3m 55s
build-linux (mnfst, mtl lnl)	6m 14s
build-windows (ptl)	9m 42s
build-linux (zmain, mtl lnl)	4m 18s
build-linux (zmain, ptl)	3m 37s
build-linux (mnfst, tgl tgl-h)	5m 51s
build-linux (mnfst, ptl)	6m 3s
build-linux (zmain, tgl tgl-h)	3m 49s
build-linux (mnfst, --all)	18m 46s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	7m 16s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	3m 49s
build-linux (-d, mnfst, lnl)	5m 13s
compare-linux-win	32s
	2h 9m 1s

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