Support task runner

[adamghill]

Support a task runner to have an easier way to run commands.

• GitHub scripts to run it all: https://github.blog/2015-06-30-scripts-to-rule-them-all/
• just: https://just.systems/man/en/ (leading contender based on Django projects)
• poethepoet: https://poethepoet.natn.io
• mise: https://mise.jdx.dev

[Tobi-De]

To avoid the issue of the user having to install an additional package, the task runner could be a Coltrane extra, e.g., pip install coltrane[just]. poethepoet is pip-installable, and as Jeff Triplett pointed out, just can also be installed with pip.

[adamghill]

Could also create a Justfile as part of coltrane create. If a user wants to use it they can, otherwise they could delete it.