Generate and manage clues

Context

Implements #7 (closed).

In images:

Slot by slot generation

One-shot grid and clues generation

What has changed?

Main Changes

common

• Added clues to Puzzle type.

spi-clue

• Created.

clue-openai-plugin

• Created.
• Requires an OpenAI API key to function.

core

• Added ClueService allowing to get clues for one or more words.
• Added the possibility to ClueService to generate clues after a grid is successfully solved, in a single request.

puzzle-repository-*

• Save clues.

cli

• Added clue get WORD [WORD...] and clue list-providers subcommands to respectively get clues and list the clue providers.
• Added --clues option to solver run subcommand to solve a grid and generate clues in a single command.

gui-view-model

• Added CluesViewModel managing the state of the clue-related views.
• Added SlotsViewModel based on box data of CrosswordGridViewModel.
• Bound selected clue with selected slot.

gui-view

• Added CluesPane listing the clues.
• Introduced a ClueListCell which, like the crossword grid boxes, has two texts: The main text is the user content and the prompt text is the system content (i.e. the content given by clue provider).
• Added the possibility to generate a clue for the selected slot with a button on the ClueListCell.
• Allowed to configure solver to generate clues for the solution found, via the SolveSplitMenuButton.

gui-controller

• Added controller for the ClueService.
• Adjusted SolverController to pass the information whether clues should be generated upon solver success.

gui-presenter

• Implemented CluePresenter.

gui

• Bound new view models to views.

Reviewers

Code has already been reviewed through several smaller MRs (see #7 (closed) for the complete list). This last big MR gives the whole picture and is the occasion to see if everything fits. Hopefully, no big issue will be raised here.