Fix bug where edge colors are randomly shuffled in mpl_draw

[IvanIsCoding]

Closes #1308. A bit embarrasing but we let that slip through in #1204.

The solution is a bit hacky but reusing Python dictionaries was the easiest way to get a set-like object that preservers iteration order.

[coveralls]

Pull Request Test Coverage Report for Build 11771360914

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 95.835%

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Totals
Change from base Build 11709175986:	0.01%
Covered Lines:	18018
Relevant Lines:	18801

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💛 - Coveralls

[mtreinish]

It's a little weird as a pattern, but this makes sense to have set like mechanics while retaining insertion order. This LGTM, before merging though was there a test we wanted to add for this to catch a potential future regression?

[IvanIsCoding]

I was checking https://github.com/Qiskit/rustworkx/blob/main/tests/visualization/test_mpl.py. Currently we have no tests asserting any attributes about the images. We just assert they can be saved.

I will create another issue to add Matplotlib that actually catch regressions