feat: add Numbers network and token icons

[shc261392]

Description

Add Numbers Protocol mainnet network icon and token icon support.

Related issues

Fixes: N/A

Manual testing steps

1. Go to Numbers Mainnet Explorer
2. Scroll down to bottom and click the Metamask icon to add network
3. Open Metamask extension to check the network and token icons

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[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.

[shc261392]

I have read the CLA Document and I hereby sign the CLA

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.77%. Comparing base (3d861ca) to head (2f605ce).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #24508      +/-   ##
===========================================
- Coverage    65.77%   65.77%   -0.00%     
===========================================
  Files         1366     1366              
  Lines        54255    54257       +2     
  Branches     14102    14102              
===========================================
+ Hits         35685    35686       +1     
- Misses       18570    18571       +1     

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