PR: Add matplotlib state to status bar

[impact27]

Description of Changes

Includes : https://github.com/spyder-ide/spyder-kernels/pull/257

• [x] Wrote at least one-line docstrings (for any new functions)
• [x] Added unit test(s) covering the changes (if testable)

• [x] Included a screenshot or animation (if affecting the UI, see Licecap)

Add matplotlib state to status bar and allows switching between inline and interactive by clicking the status bar.

Issue(s) Resolved

Fixes #

Affirmation

By submitting this Pull Request or typing my (user)name below, I affirm the Developer Certificate of Origin with respect to all commits and content included in this PR, and understand I am releasing the same under Spyder's MIT (Expat) license.

I certify the above statement is true and correct:

[pep8speaks]

Hello @impact27! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers:

Comment last updated at 2022-08-30 16:36:20 UTC

[ccordoba12]

Thanks @impact27 for addressing my review! I fixed some minor issues I found when testing your PR locally. Besides that, I think nothing else is needed here. So, after our tests pass, I'll merge it.