add rpc_methods endpoint

[insipx]

• method
• tests

closes #65

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 82.64%. Comparing base (2f93b91) to head (67c54dc).

Files	Patch %	Lines
xps/src/main.rs	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   78.75%   82.64%   +3.89%     
==========================================
  Files          14       14              
  Lines         579      657      +78     
==========================================
+ Hits          456      543      +87     
+ Misses        123      114       -9     

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[37ng]

Let's end this week with a LGTM and looking forward to what we'll be building this year.