deprecate Integrator.run for integrator.call

[nstarman]

Not sure if you were interested in this for gala. If you are, I'll finish the checklist / prune some unneeded lint changes that snuck in here.

Checklist

• [x] Did you add tests?
• [x] Did you add documentation for your changes?
• [x] Did you reference any relevant issues?
• [x] Did you add a changelog entry? (see CHANGES.rst)
• [x] Are the CI tests passing?
• [x] Is the milestone set?

[adrn]

Yes, I think it makes sense to bring the API's closer before we all switch over to galax :). Thanks!

[nstarman]

Added a test and changelog.

[adrn]

No idea why the testpypi upload step is failing, but it must be unrelated to this PR.

Thanks!

[adrn]

Sorry for the long delay on this @nstarman -- it fell off my radar! Thanks for this.