feat(minor-ampd): add command to set rewards proxy

[cjcobb23]

https://axelarnetwork.atlassian.net/browse/AXE-4980

[codecov]

Codecov Report

Attention: Patch coverage is 21.87500% with 25 lines in your changes missing coverage. Please review.

Project coverage is 93.59%. Comparing base (62273a3) to head (c700aa6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
ampd/src/commands/set_rewards_proxy.rs	0.00%	22 Missing ⚠️
ampd/src/lib.rs	0.00%	1 Missing ⚠️
ampd/src/main.rs	0.00%	1 Missing ⚠️
packages/router-api/src/primitives.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #631      +/-   ##
==========================================
- Coverage   93.65%   93.59%   -0.07%     
==========================================
  Files         240      241       +1     
  Lines       33838    33870      +32     
==========================================
+ Hits        31692    31699       +7     
- Misses       2146     2171      +25     

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