Ability to buy native currency and tokens on Optimism and Arbitrum

[nikoferro]

Explanation

Currently, Transak is the only provider offering on-ramps to these networks.

Before: no on ramp on Optimism and/or Arbitrum
After: ability to purchase ETH and supported tokens on these L2

More Information

See ONRAMP-191

Screenshots/Screencaps

Manual Testing Steps

1- Switch network to Optimism
2- Check if possible to buy ETH and USDC through Transak

1- Switch network to Arbitrum
2- Check if possible to buy ETH, SPA, USDC, USDS through Transak

Pre-Merge Checklist

• PR template is filled out
• IF this PR fixes a bug, a test that would have caught the bug has been added
• PR is linked to the appropriate GitHub issue
• PR has been added to the appropriate release Milestone

+ If there are functional changes:

• Manual testing complete & passed
• "Extension QA Board" label has been applied

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[nikoferro]

@brad-decker related to the PRs you have been reviewing