add chain 314, Filecoin mainnet

[kmadorin]

Add New Chain 314

Thanks for your pull request to add a new support in Sourcify.

If you haven't done so, please follow the instructions on how to request chain support in docs.

Please check the following items before submitting your pull request.

Checklist

• [x ] The branch is named as add-chain-<chainId>.
• I haven't modified the chains.json file directly.
• In sourcify-chains.ts file
  • I've set supported: true.
  • I've set monitored: false.
  • I haven't added an rpc field but the one in chains.json is used (if not, please explain why).
• I've added a test in chain-tests.js file.
• test-new-chain test in Circle CI is passing.

_{View in Huly HI-656}

[kuzdogan]

Looks good. node-v16 failing is not related to this. Thank you!