Create functions that allow an agent to mint GNAI circle tokens

[gabrielfior]

An organization (https://gnosisscan.io/address/0x410baae2ff392523363d86b8a444f604504b3c1c) - GNAI was created.

The current idea is to use Circles from this organization (GNAI tokens) (wrapped as an ERC20) as collateral on Omen.

When placing bets, agents should have a positive balance of GNAI tokens. Mechanism looks as follows:

• Agent is created (new private_key, etc) - a trust connection is manually created for the agent (this can be automated in the future)
• Two actions must occur:
  1 - Agent mints own CIrcles
  2 - Agents mints GNAI tokens, for later betting

Functions for 1 and 2 should be developed.
Also to be clarified - should these functions be added to PMAT or to a different repo.