Qiskit / qiskit-fermions / 28108133151

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Edge-/Transfer-Vertex operators (#123)

* feat: core implementation of the UndirectedInteractionOperator

* feat: UndirectedInteractionOperator conversion functions

* feat: DirectedInteractionOperator and conversion logic

* [wip] greedily expose the new data structures to Python API

* Add Python-based tests of UndirectedInteractionOperator

* Add Python-based tests of DirectedInteractionOperator

* Add Python-based tests for un-/directed mapper functions

* fix: remove unused import

* [wip] get started on InteractionOperator python API docs

* docs: class-level docstrings for InteractionOperators

* fix: adjoint of InteractionOperator classes

* docs: method docstrings for InteractionOperator python API

* docs: function docstrings for interaction operator mappers

* feat: add mapping generators for InteractionOperator types

* test: for the new interaction operator generator mappers

* refactor: update with recent __str__ -> __format__ changes

* fix: lint

* rename: UndirectedInteraction -> EdgeVertex

The previous name was actually misleading: the edge operators are in
fact still directed (since `E_ij = -E_ji`). This renaming should avoid
potential confusion around this.

* rename: DirectedInteraction -> TransferVertex

The previous commit renamed `UndirectedInteraction` to `EdgeVertex` to
avoid potential confusion. This commit aligns the formerly used
`DirectedInteraction` to become `TransferVertex`.

* refactor: ensure consistent naming of `map_action`

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