Applying pylint to gempyor

[emprzy]

Describe your changes.

Adds a pylint linting GH action for gempyor. You can also spur the linting (along with black formatting) before PR by running ./bin/lint from the flepiMoP directory. Presently, the only adjustment this pylint implementation has is a max line length of 92 chr. In the future, we may look to:

• add a --fail-under flag for failing under a certain score,
• except certain error codes that we deem not helpful,
• adjust pylint to only look at changed files?
• anything else we decide...

Does this pull request make any user interface changes? If so please describe.

gempyor will now be linted with pylint through a GH action upon PR.

What does your pull request address? Tag relevant issues.

This pull request addresses GH- #398

[TimothyWillard]

Looks good, a few minor comments. One thing that is missing is documentation, probably here is most appropriate: https://iddynamics.gitbook.io/flepimop/development/python-guidelines-for-developers.