Sponsored Fees

[Nana-EC]

Description:
This HIP proposes an expansion to the approval and allowance network logic (e.g.CryptoApproveAllowance ) by allowing any account on the network to sponsor the payment of the fees for another account’s submitted transactions. In this way account Alice may assign an HBAR / token transaction fee allowance for EOA account Bob or Contract account Carol and pay the fees due to nodes, the network and accounts for any transactions they submit, thus allowing Bob or Carol to have zero balance and still transact on chain.

This proposal extends the existing Approval and Allowance API by adding 2 new allowance types (TransactionFeeAllowance and CustomFeeAllowance) that inform the delegation of fee payments to another account without requiring one-off approval for each transaction. This feature enhances flexibility and efficiency in managing transaction costs, particularly for high volume applications.

Related issue(s):

Fixes #912

Notes for reviewer:
Expect more changes soon.
There's an outstanding item to condense the Allowances types to instead be scopes on the existing allowances as a cleaner API form

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

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