feat: Styles

[db0]

• Allows anyone with the customizer role to make styles for text or image
• Styles can include any of the params for those gens, or only some of them
• Styles must have a pre-specified model list
• Styles can be used via ID or name, or user::name, or style::name or user::style::name
• Adds all API endpoints
• Allows anyone to group any number of styles together into a single collection
• When a collection is used as the style of a request, a random style is applied from those inside

Also finally upgrades sqlalchemy

[db0]

@tazlin I believe this PR is ready for a squash merge. The test pass in the dev horde, but fail in the github actions because the SDK is not aware of the new endpoints.

I suspect this is not a blocking point as the SDK can be updated at a later time. Do take a look at the PR to see if you notice anything suspcious, although with 2.5K of linechanges I don't expect that you will dig into everything.

[tazlin]

As you noted, the tests fail due to a lack of definitions only at this point. Given the nature of the changes, I believe that any issues with the new validation will get sorted out by user-driven reports. The style feature itself is so heavily dependent on front-end integration at this point - leaving the impacted audience at very small numbers - that it should be safe to move forward for now.