Apply black and isort formatting and modernize config files

[taldcroft]

Description

This does the following:

• Apply Black formatting in a few steps
• Apply isort to sort imports
• Add pyproject.toml to configure black and isort behavior
• Add .pre-commit-config.yaml to allow pre-commit hooks to be installed
• Remove pytest.ini. There is a new paradigm where we will use a single global definition of that file, as provided by the ska_testr repo. This new pytest.ini should be placed in a directory above all your Ska git repos (e.g. ~/git).

Interface impacts

None

Testing

Unit tests

• [x] Mac

Independent check of unit tests by [REVIEWER NAME]

• [ ] [PLATFORM]:

Functional tests

Confirmed that the pre-commit hooks work as expected.

[matthewdahmer]

@taldcroft I support this. The only hangup I have is the use of double quotes by default; I find the use of single quotes makes code look better, but this isn't really that big of a deal for me. I generally find the code formatting by black to be quite pleasant to read. I didn't see a way in the black api to ignore specific lines that are intentionally formatted in such a way that would otherwise be re-formatted, is this an option?

[taldcroft]

OK, I'll re-do this PR after #127 and #125 get merged. I will also put in a pre-commit hook config to make it easier to not forget.

After a little while I got used to the double quotes and now they look better. One thing is that I almost always type a single quote and then when I'm done with a section of code I have black fix it with option-shift-f in VS code.