Add scalartype parameter to `AbstractTensorMap` #139

Job	Run time
Julia 1.6 - ubuntu-latest - x64	36m 52s
Julia 1.6 - macOS-latest - x64	37m 31s
Julia 1.6 - windows-latest - x64	38m 59s
Julia 1 - ubuntu-latest - x64	28m 27s
Julia 1 - macOS-latest - x64	26m 0s
Julia 1 - windows-latest - x64	30m 19s
Julia nightly - ${{ matrix.os }} - ${{ matrix.arch }}	0s
	3h 18m 8s

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