Generate a predictable and customizable GUI in cuiman

[forman]

The Gavicore package has been enhanced by a new UI generator which converts OGC API - Process descriptions (or OpenAPI Schema) into user interfaces for editing input parameters:

• Added a new extendable UI generation framework in gavicore.ui.
• The framework itself does not enforce a dedicated widget library, but it can be configured to output UIs for any Python widget library.
• Support for UI generated with the Panel library is inbuilt as it is used in the Cuiman GUI.
• Dropped subpackage cuiman.gui.component.
• Added a pixi tool to demonstrate and debug generated UIs from OpenAPI Schema: pixi run schema2ui.

Addresses #74
Closes #55
Closes #37
Closes #38

Note that many points described in #74 are not addressed in this PR but will be addressed in follow-up PRs:

• Fully support OpenAPI Schemas. We lack discriminator, oneOf, anyOf, allOf, $ref, and some more
• Adjust ClientConfig.is_advanced_input() to the new solution (see TODO).
• Document capabilities and limitations. Add guide for OGC processes server developers.
• See the numerous TODOs in gavicore.ui code and create an umbrella issue

The best way to start reviewing this PR is running the new schema2ui tool understand the tool's code and debug into the UI generation process:

pixi run schema2ui

Checklist (strike out non-applicable):

• Changes documented in CHANGES.md
• Related issue exists and is referred to in the PR description and CHANGES.md
• Added docstrings and API docs for any new/modified user-facing classes and functions
• Changes/features documented in docs/* (just architecture diagrams, docs still needed, see Document the client GUI #42)
• Unit-tests adapted/added for changes/features
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[pont-us]

Quite a few comments and suggestions, but approving since I don't need to review again.

[clarasb]

Really nice!

I have some small suggestions and I made some observations while running pixi run schema2ui. For the observations see the comments in gavicore/tests/ui/schemas/.

[forman]

@clarasb I'd like to not fix the individual editor issues you discovered in this PR and instead create new ones, because they are cleanly isolated. They are

• various issues with the bbox map-editor
• control step-size for integer/float sliders
• issue with partly hidden date ticker in array editor