PR: Refactor Remote Client kernel management

[hlouzada]

Description of Changes

• Update Base API to handle the "ensure" server/connection/kernel logic
• Refactor Jupyter API using the new module system and Base API #PR: Add remote filesystem API to the Remote client plugin #23381
• Move the plugin's "create new kernel" and all "container" logic to ipythonconsole.
• Move kernel's implementation tests to ipythonconsole.
• Update tests without the need to catch signals.
• Add jupyter_api tests.

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

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

Refactor the remoteclient plugin's remote kernel logic so the kernels magnament
are done in ipythonconsole plugin using the base Jupyter's API with the new modules system.

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: @hlouzada

[ccordoba12]

Great work here @hlouzada! Just some small questions and a couple of suggested fixes for you.

[ccordoba12]

I haven't seen this before. What's __qualname__ used for?

[hlouzada]

It's used to get the fully qualified name from the python object. I'm using it in case someone might define another API with the same name. This way there's no overwrites when using the register_api decorator

[ccordoba12]

Thanks @hlouzada!