[Task]: Improve gas estimation for layer2

[msarcev]

Task description

Improve gas estimation for layer2 transactions

Use gasBurned retrieved from "estimatedgas" endpoint to update the gasBudget field in metadata.
The gasBudget should be set to gasBurned + 1. The "1" is needed for it to work, some optimization they have in wasp.

i.e.
metadata = getLayer2MetadataForTransfer(transactionDetails, gasEstimatePayload.gasBurned + 1)

Requirements

• Improve the gasBudget by using the gasBurned
• Add 1 grain of salt to it
• Leave a comment to explain the magic "1"

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