feat: enhance max_supply logic for Jetton supply management

[iamIcarus]

PR Summary: Update max_supply Attribute in Jetton Implementation

This PR updates the handling of the max_supply attribute to improve flexibility and enforce stricter rules.

Key Changes:

1. Optional max_supply:

   • max_supply can be 0 to indicate unlimited supply.

2. Minting Rules:

   • Minting stops when max_supply is reached (if not 0).
   • Unlimited minting allowed if max_supply is 0.

3. Update Restrictions:

   • max_supply can only be set to 0 during initialization (JettonInit).
   • max_supply can only be increased via JettonSetParameter.

4. Tests:

   • Added basic tests to verify minting behavior and max_supply constraints.

[ya7on]

Hello. Awesome PR, thank you