dev_tools/pylint fails with pylint-3 and later

[pavoljuhas]

The pylint execution fails on loading the custom 'pylint_copyright_checker' plugin.
Related to quantumlib/Cirq#6351

[pavoljuhas]

There is no pylint_copyright_checker.py file in this repository, but there
is also no wrong-or-nonexistent-copyright-notice check enabled in dev_tools/.pylintrc.

pylint-3 seems to error on plugins that do not exists, whereas pylint-2 silently ignored them.
It also discovers a plenty of lint issues that were not reported before (perhaps missing --recursive=yes).

This should be re-scoped to syncing with cirq pylint settings.

[pavoljuhas]

@dstrain115 - please reopen, there are open TODO items in dev_tools/.pylintrc for rules that need to be fixed and enabled.

[dstrain115]

@solodov If you want to help with these, we need to enable the pylint tests one-by-one and fix the resulting pylint errors.