feat: Add IOTA derivation path

[FrederikBolding]

Add IOTA derivation path since they use ed25519, which our default resolution logic doesn't allow for SLIP-44 defined chains.

---

Note

Adds the IOTA ed25519 derivation path m/44'/4218' to the supported snaps derivation paths.

^{Written by Cursor Bugbot for commit 9fbbbd8. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (ac51af7) to head (9fbbbd8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3653   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files         417      417           
  Lines       11811    11811           
  Branches     1844     1844           
=======================================
  Hits        11609    11609           
  Misses        202      202           

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