PR: Add possibility to disable history logging

[oscargus]

Description of Changes

• 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)

Added the possibility to disable history logging.

By design this is always enabled when starting Spyder. I thought about adding a configuration option for it and storing upon exit. However, it seems to be a potential source of issue reports... Also, I added it as a button for easy access (adding it to the corner menu may be a possibility, but then it seems like one may just as well not add it...). To make it a bit more clear I used two different icons. Maybe one can make it even more clear by, say, a red cross above it when disabled, but I'm not really a GUI designer (nor a programmer...).

There are also tool tip texts that changes from "History logging enabled" to "History logging disabled".

Not sure how to write a test for this. I could not find any tests for the history logging in the IPython console, so nothing to really copy for modification...

Issue(s) Resolved

Fixes #716

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: Oscar Gustafsson/@oscargus

[oscargus]

Just learnt about #7141. If that is merged, I belive that this PR will not be any useful (will not work) anymore. I'll wait with closing it until #7141 is merged though.

[ccordoba12]

Sorry to make you waste your time, but the plan is to merge #7141 in beta5 (to be released next month).

After that, you could reimplement this using IPython config system, like we do here:

https://github.com/spyder-ide/spyder-kernels/blob/master/spyder_kernels/console/start.py#L100

But for that, we also need to merge first the improvements @impact27 has done to our kernel communication architecture, which I hope to do next week.