feat: sf-598 estimate gas fee with txn v3

[stanleyyconsensys]

This PR is to allow RPC method starkNet_estimateFee to be completable with TXN v3

it take an extra parameter priceUnit to indicate the requested rpc is looking for Wei Estimation or Fri Estimation where Wei is the default value

it has dependency on

• https://github.com/Consensys/starknet-snap/pull/219
• https://github.com/Consensys/starknet-snap/pull/202

RPC call example:

{
  method: 'wallet_invokeSnap',
  params: {
    snapId: '[SNAP_ID]',
    request: {
      method: 'starkNet_estimateFee',
      params: {
        // ... existing implementation 
        priceUnit: "FRI" // FRI or WEI,
      }
    }
  }
}

[sonarcloud[bot]]

Quality Gate failed for 'consensys_starknet-snap-starknet-snap'

Failed conditions
68.2% Coverage on New Code (required ≥ 80%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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[sonarcloud[bot]]

Quality Gate passed for 'consensys_starknet-snap-wallet-ui'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud