feat: add support for custom extractAbi from target

[luizstacio]

Problem

Currently on fuels-ts a TS SDK for Fuel. We enable users to generate contract types using our typechain-target-fuels. Recently we have implemented a flat ABI.json model, that is not a valid Ether ABI.

But when running runTypeChain by CI or API, the implementation on typechain executes an extractAbi method to filter empty ABI files (see file line in typechain). The current way it's implementated is impossible for the Target, to implement a custom extractAbi.

Solution

The proposed solution for this use case is to enable the TypeChainTarget to also export extractAbi function wich will replace the extractAbi, on the skipEmptyAbis.

export const extractAbi = (rawJson: string) => myCustomExtractAbi(rawJson);

export default class MyCustomTarget extends TypeChainTarget {
  .....
}

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