getAvailablePlays
Gets a list of available plays for the player with the specified piece type. A play is considered available if placing a piece of the given type at that position would result in capturing at least one of the opponent's pieces.
Return
A list of coordinates where the player can place their piece.
Parameters
board
The current state of the board.
myPieceType
The type of piece for the player (e.g., BLACK or WHITE).