feat: add Guardarian partner for US onramp

[justinenerio]

Changes

add Guardarian partner for US onramp

Related issues

Fixes #1228

Screenshot

Checklist

• PR is ready for review (if not, it should be a draft).
• PR title follows Conventional Commits guidelines.
• Screenshots/video added.
• Tests added.
• Self-review done.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6070b62) 79.21% compared to head (4512b01) 79.21%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1229   +/-   ##
=======================================
  Coverage   79.21%   79.21%           
=======================================
  Files         183      183           
  Lines        4047     4047           
=======================================
  Hits         3206     3206           
  Misses        841      841           

Flag	Coverage Δ
solana-beta	79.21% <ø> (?)
solana-stable	79.21% <ø> (ø)

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