feat: add sendMessage endpoint

[37ng]

closes #19

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (200068d) 89.07% compared to head (ee02daf) 89.85%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
xps-gateway/src/lib.rs	0.00%	2 Missing ⚠️
gateway-types/src/error.rs	0.00%	1 Missing ⚠️
messaging/src/lib.rs	98.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   89.07%   89.85%   +0.78%     
==========================================
  Files          10       12       +2     
  Lines         293      355      +62     
==========================================
+ Hits          261      319      +58     
- Misses         32       36       +4     

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[37ng]

Turned out I was using out of date contract, I'm updating this and use sendMessageSigned

[jac18281828]

This looks like a good start. Let me know once it's ready for a final review and I can start and run it and check it out in more detail.

The send message signed should have a multiple message test to confirm nonce is working properly. In general, a few more tests would be great.

[37ng]

Ready for review

[insipx]

in light of discussion of #52 can approve

[37ng]

in light of discussion of #52 can approve

Just added the SendMessageResult following the current pattern + a failure test.