move to pixi

[veenstrajelmer]

Todo:

• inspriation: hydromt_delft3dfm, xugrid
• update pyproject.toml
• convert tests workflow
• convert docs workflow
• convert release workflow
• remove dedicated bumpversion: pixi project version major
• update contributing documentation (no anaconda download, but pixi, create env, test, docs, publish)
• consider adding spyder-kernels: add spyder-kernels hydromt_delft3dfm#258 >> this is not clean, avoid this by using vscode/pycharm instead
• consider pre-commit config
• auto-update pixi lockfile workflow (like hydromt)
• test on minimal dependency versions (and minimal Python version) >> uv has --resolution lowest and pixi has solve-strategy lowest-direct>> add feature/env that pins the minimal package versions like in dfm_tools?
• replace sonarcloud features with proper linting? Sonarcloud is basically a extensive linter (code complexity, missing variables, unneccesary imports, etc)
• as close to uv as possible (or uv?) >> uv supports only a single environment? >> uv does not support multiple
• pixi support is not complete yet in PyCharm: https://youtrack.jetbrains.com/issue/PY-79041/Support-Pixi
• consider main branch test for most important dependencies (like at hydromt_delft3dfm), so things don't break suddenly