Add team playing functionality

[mittal-parth]

• Need a max limit on the number of players for the hunt, team size attribute, set when the hunt is created.
• Users randomly paired with other players who have registered for the hunt OR have the option of choosing. Can be kept from the admin side for starters.
• Team players visible after registration to the registrant.
  • team matching has to be either done by the admin
  • or users can choose their teammates.
• Team details to be stored on the contract.
• Same NFT given to all team members.