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Add features to map graph nodes to Hilbert space sites

Vicentini Filippo requested to merge graphop-mapping into master

Created by: femtobit

As brought up in #922 (closed), in composite systems like

hi = Fock(N=1) * Spin(1/2, N=10)

it'd be nice to be able to define graph operators acting on subsets of Hilbert sites. This requires a mapping from the graph nodes to Hilbert sites.

With this PR, this can be provided when creating GraphOperator (and Heisenberg, which is a subclass):

g = Chain(10)
h = Heisenberg(hi, g, acting_on_subspace=list(range(1, 11)))
# equivalently as a shorthand:
h = Heisenberg(hi, g, acting_on_subspace=1)

(Closes #922 (closed).)

EDIT: Updated examples with alternative design which uses graph.node_labels. EDIT 2: Updated examples with current naming. EDIT 3: Updated example back to initial version.

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