feat: auto-generate ruleset cache on source change

[s-ff]

Closes #1898. This is a proposal for the issue discussed in #1898.

Let's test out its feasibility and make sure it does not introduce an overhead.

[mr-tz]

Do you think it's possible to cleanly move the dev/git logic into capa.main?

agree here to move this to capa.main or a utils file.

[s-ff]

beyond splitting this up we'd prefer to call this from capa.main (and not deep in the library) can we add the check if this is a dev environment there instead? (e.g. around get_rules)

Moving the dev environment checks to capa.main and importing them from capa.main would create circular dependencies when I tested it.

[mr-tz]

beyond splitting this up we'd prefer to call this from capa.main (and not deep in the library) can we add the check if this is a dev environment there instead? (e.g. around get_rules)

Moving the dev environment checks to capa.main and importing them from capa.main would create circular dependencies when I tested it.

I mean to call it from there not to implement them in main.

[mr-tz]

Any concerns or blockers before merging this?

[mr-tz]

ping @s-ff, @williballenthin, @mike-hunhoff