fix: tron fee limit

[otsybizov]

🤖 Linear

Closes CONG-XXX

[Copilot]

Pull Request Overview

This PR centralizes the Tron energy price into a constant and updates how the transaction fee limit is calculated by incorporating the gas price.

• Introduce a GAS_PRICE constant for the energy unit price.
• Update TronWeb3Signer to calculate feeLimit as gasLimit * gasPrice.
• Refactor getGasPrice to return the new GAS_PRICE constant.

Comments suppressed due to low confidence (1)

packages/adapters/chainservice/src/shared/rpc/tron/provider.ts:327

• Add unit tests for getGasPrice and the fee limit calculation to verify correct behavior under various input scenarios.

    return GAS_PRICE;