chore: rewrite project structure

[jjfrench]

Description

Rewrites the project structure in python rather than TypeScript and Node - aims to not change any of the infrastructure

(would close open dependabot security issues for javascript)

[hrodmn]

@jjfrench thanks for taking this on! I have a few ideas for you to consider but don't have any very strong opinions here.

I think the most actionable one might be to consider breaking the big global Config class into smaller specific configs for various components. Right now we take the big Config and construct things like PgstacDbConfig directly from the Config properties. I think it would be cleaner and easier to maintain if we did not need to pass properties through the global Config to the lower level configs. That way if we change things or add a property we would only need to add it in one place rather than adding it to Config and adding it to XXXConfig.

We don't need to do it in this PR but it is probably time to break PgstacInfra into some smaller constructs! That thing is a beast.

[jjfrench]

@hrodmn sorry, it's a lot to review again - but most of the recent changes are from porting over #110, ruff formatting, and shuffling the config classes around.

[hrodmn]

@jjfrench thanks for all of your work on this. It might be worth one more pass at the config layout to make it simpler, but it's a compelx creature - none of my comments/suggestions are blocking.

[hrodmn]

just a few more ideas!

[hrodmn]

Nice work! Thanks for working through the config details with me.