Move setup.cfg configuration to pyproject.toml

[chrisbillowsMO]

Is your feature request related to a problem? Please describe.

Modernise infrastructure configuration by moving setup.cfg to pyproject.toml per this discussion.

Would you be able to help out?
Would you have the time and skills to implement the solution yourself?

I have the skills to "attempt" it! 😁

I'll open a second issue to look at the migrating the setup.py configurations after work on setup.cfg has progressed.

[bouweandela]

Note that there is also still a .pylintrc file, which can be moved to pyproject.toml as was already done for ESMValCore in ESMValGroup/ESMValCore#1726.

[bouweandela]

Once you get to setup.py, the lint command can just be removed, I don't think anyone uses it:

ESMValTool/setup.py

Line 264 in 85e24b5

'lint': RunLinter,