Mayachain AMM approve

[0xp3gasus]

Create in the Mayachain AMM a method to make the approves to the Mayachain router. Take the Thorchain AMM as reference

  async approveTCRouterToSpend(
    asset: Asset,
    amount = MAX_APPROVAL,
    walletIndex = 0,
  ): Promise<ethers.providers.TransactionResponse> {
    const contractAddress = getContractAddressFromAsset(asset)
    const router = await this.thorchainCache.getRouterAddressForChain(asset.chain)

    const approveParams: ApproveParams = {
      contractAddress,
      spenderAddress: router,
      amount: baseAmount(amount.toString(), this.evmClient.config.gasAssetDecimals),
      walletIndex,
    }
    return await this.evmClient.approve(approveParams)
  }