Add validation for zero amount in Jetton operations

[iamIcarus]

Validation for Zero amount

Added a nativeThrowUnless(ERROR_CODE_INVALID_AMOUNT, msg.amount > 0) check to prevent operations with amount <= 0 in:

• JettonMint
• JettonBurn
• JettonTransfer
• JettonBurnInternal
• JettonTransferInternal

This ensures that invalid transactions are rejected early, adhering to best practices for Jetton implementations.

Prevent Invalid max_supply Updates

• Removed the ability to initialize Jetton with a max_supply of 0.
• Prevented updating max_supply to a value lower than the current supply or to 0.

Test Improvements

• Updated tests to use opcode constants from constants for better maintainability and consistency.

[ya7on]

Thank you again for contribution! These changes are very helpful.
Below I commented questions you asked in code comments.

[iamIcarus]

Summary of changes:

• reverts the added logic to max_supply
• commits now comply with commitlint
• adds ERROR_CODE_INVALID_AMOUNT zero amount check [escape early, guard unexcepted behavior]
• refactor test to use OP_CODE names instead of the values