v0.28.0

PromptingTools v0.28.0

Diff since v0.27.0

### Added

• Added Mistral coding-oriented Codestral to the model registry, aliased as codestral or mistralc. It's very fast, performant and much cheaper than similar models.

### Commits

Merged pull requests:

• Add Mistral Codestral (#160) (@svilupp)