Added coordinate map for Heron devices

[quantumjim]

Summary

Added a coordinate map, so that plot_gate_map can use the same layout the the IBM Quantum Platform, and not create one randomly.

Details and comments

Image below shows the output for from qiskit.visualization import plot_gate_map plot_gate_map(backend, figsize=(10,10)).

[qiskit-bot]

One or more of the following people are relevant to this code:

• @enavarro51
• @Qiskit/terra-core

[mtreinish]

I'm not a huge fan of continuing this pattern, we moved to using graphviz for graph visualization (see: https://github.com/Qiskit/qiskit/issues/9031) so we didn't have to continue hard coding magic layouts in the visualization functions moving forward. It's not a really good solution because it assumes that all backends prefixed with ibm_ or fake_ and n qubits want to use the same layout. Prior to #9031 being implemented it was not great but better than using the algorithmic layout from rx.spring_layout() (which is garbage for more than a handful of nodes) but we're in a better state now. If the graphviz layout is deficient in some way it might be a better approach if we can come up with a better algorithmic layout for this.

[coveralls]

Pull Request Test Coverage Report for Build 9711519430

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.01%) to 89.753%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit/visualization/gate_map.py	0	1	0.0%
<!--	Total:	0	1	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
qiskit/visualization/gate_map.py	1	6.95%
crates/qasm2/src/lex.rs	4	92.11%
<!--	Total:	5		-->

Totals
Change from base Build 9703107599:	0.01%
Covered Lines:	63808
Relevant Lines:	71093

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💛 - Coveralls

[quantumjim]

I agree that qubit_coordinates_map is not the best way to do things and should disappear in a future release. But while it is in the code, shouldn't it reflect public devices?