playground: factor out playground-sys crate for faster builds #131

Job	Run time
count LOC	2m 0s
feature-matrix / Generate feature matrix	13s
build accelsim ()	58s
build accelsim-sim ()	7m 32s
build accelsim-sim (upstream)	7m 9s
build accelsim-trace ()	6m 19s
build accelsim-trace (upstream)	6m 2s
build casimu ()	2m 55s
build casimu (python)	2m 57s
build invoke-trace ()	6m 57s
build playground ()	2m 43s
build playground-sys ()	2m 9s
build playground-sys (parallel)	2m 36s
build plot ()	1m 14s
build profile ()	1m 23s
build stats ()	28s
build trace ()	6m 29s
build trace (plot)	6m 26s
build trace-model ()	29s
build utils ()	50s
build validate ()	10m 22s
build validate (remote)	17m 14s
build xtask ()	56s
	1h 36m 21s

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