Add TensorKitSectors as a separate module #186

Job	Run time
Julia 1.6 - ubuntu-latest - x64	52m 55s
Julia 1.6 - macOS-latest - x64	1h 8m 24s
Julia 1.6 - windows-latest - x64	1h 6m 24s
Julia 1 - ubuntu-latest - x64	39m 58s
Julia 1 - macOS-latest - x64	48m 10s
Julia 1 - windows-latest - x64	46m 21s
Julia nightly - ubuntu-latest - x64	49m 59s
Julia nightly - macOS-latest - x64	46m 22s
Julia nightly - windows-latest - x64	52m 59s
	7h 51m 32s

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