Move to Poetry for Python

[taddes]

Description

Update to Poetry for Python dependency management.

This puts all the tools, dependencies, and commands in place. However, we won't spin our wheels right now converting over in CI, moving from venv and whatnot, since we're not prioritizing Sync modernization atm. We will address down the road, but for the time being increases developer speed and experience for checks and makes some improvements to the python utilities.

Benefits:

• Simpler management of scoped dependencies within subdirectories
• Faster build times
• Better auditing of out-of-date packages
• Modern Python standard

Testing

How should reviewers test?

Issue(s)

Closes 4293.

[jrconlin]

There's a potential that folk might discover this package while looking for a stand-alone Sync storage server. Let's be exceptionally clear about what this is and how it's being used.

Suggested change

	description = "sync storage server in rust"
	description = "Support package for the Mozilla Sync storage server, written in rust. This is not a 'stand alone' server and is not meant for general use to run your own Sync storage server. Please see [the wiki page](https://github.com/mozilla-services/syncstorage-rs/wiki/overview) for further details."

[jrconlin]

Yeah, i'd have words with the folk behind black and why they want python to look like perl, but 🤷🏻

[taddes]

Thanks for the comments @jrconlin . I shelved this one before MozWeek, but I don't think it hurts to merge in now, we can pick up the steps later once we've finished our priority tasks. All the parts are there to utilize the tooling with some format improvements, we'll just make the move to Poetry (officially, should we wish) down the road.