Refactor -> move simple resolver to separate mod #7463

Job	Run time
check-website	9s
scarb-metadata compatibility check	47s
check-rust	3m 40s
build test linux x86-64	3m 50s
build test windows x86-64	7m 1s
doc tests	3m 22s
test linux x86-64 1/8	16m 1s
test linux x86-64 2/8	16m 45s
test linux x86-64 3/8	15m 25s
test linux x86-64 4/8	13m 42s
test linux x86-64 5/8	11m 43s
test linux x86-64 6/8	9m 23s
test linux x86-64 7/8	9m 19s
test linux x86-64 8/8	10m 24s
test windows x86-64 1/8	13m 29s
test windows x86-64 2/8	16m 43s
test windows x86-64 3/8	13m 36s
test windows x86-64 4/8	12m 45s
test windows x86-64 5/8	11m 19s
test windows x86-64 6/8	9m 21s
test windows x86-64 7/8	8m 37s
test windows x86-64 8/8	10m 12s
	3h 37m 33s

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