Pylint - switch to Google style guide

[askmeegs]

Current we have a pylint file - https://github.com/GoogleCloudPlatform/bank-of-anthos/blob/master/.pylintrc - that ignores certain pylint errors in the Python service source code.

Let's try to remove most of these ignores to get the most out of linting, using Google's python style guide as source material for what messages might be okay to ignore.

[bourgeoisor]

This is still planned in the long term.

[bourgeoisor]

Still want to do this. @glasnt also suggested considering black as an alternative to pylint.

[glasnt]

python-docs-samples uses flake8 (to conform to the styleguide) and black is optional (docs). The flake8 config in noxfile.py should be useful here.

[parthea]

pyink is a fork of black under the Google org and may be an alternate to black https://github.com/google/pyink

[parthea]

isort tool can also be used to sort imports https://github.com/PyCQA/isort

[minherz]

The work on this item is postponed to Q4'24