Reduce Read/writes and add `get_board()` for TicTacToe

[bitzoic]

Type of change

• New feature
• Improvement (refactoring, restructuring repository, cleaning tech debt, ...)

Changes

The following changes have been made:

• Reduces the number of reads and writes in the TicTacToe game by pushing them ad variables to the stack or adding them to the heap.
• Adds the get_board() function to return the current board and positions.
• Adds the get_game_state() function to return the current state of the game.
• Adds the get_current_player() function to return the current players turn.
• Adds the get_players() function to return the current players.
• Changes the board in storage from a StorageMap to a StorageVec.
• Adds missing inline docs
• Adds missing comments

Notes

• A view function to retrieve the current state of the game was requested by an internal team member

[Dhaiwat10]

Thanks @bitzoic! Might be worthwhile to add a get_game_state function too for the UI