forge(verify): OKLink support

[bixia]

Motivation

To add support for the OKLink explorer contract verification. since the OKLink use almost the same API as the etherscan does for the contract verification part. the only difference is that the OKLink requires the Ok-Access-Key pass in the header, while etherscan requires the x-apiKey pass in the header.

Solution

To make the OKLink API more similar to the Etherscan API, the oklink backend decide to handle the API_KEY the same as etherscan does. so, we basically only add an entry point as blockscout does.

Reference

• https://www.oklink.com/docs/zh/#explorer-rpc-api-contract-verifysourcecode
  Closes Add support for OKLink verification #7724
  closes forge(verify): OKLink support #7586

[mattsse]

lgtm, ty

[bixia]

forge verify-contract 0x230885033f14b1F7D8f879f086d2b86656dDB125 Counter --verifier oklink --verifier-url https://www.oklink.com/api/explorer/v1/contract/verify/async/api/ethsepolia  --api-key $OKLINK_API_KEY --chain sepolia --compiler-version 0.8.13