[Refactor] separate puzzle-specific rules/constraints to their own workspaces

[T0nyX1ang]

Some rules and constraints are general, while others are not. Putting specific rules and constraints in the utils will make more efforts to maintain.

So, if a rule/constraint is assumed to be specific to only one puzzle, it will be moved to the puzzle's workspace. Once this rule/constraint can be extended to different puzzles, we will consider to put it back to the utils.rules directory.

Currently, the following rules/constraints will be modifed:

• nori_adjacent (in Norinori)
• avoid_unknown_misaki (in Nurimisaki)
• valid_stostone (in Stostone)

The following rules/constraints may be modifed:

• unique_linecolor (in Binairo)
• identical_adjacent_map (in Tents)

[T0nyX1ang]

Close it as finished, but the status may change when changes happen.