Improve service logs and release v0.7.1

[poszu]

• improved logs around verification of the generated proof
• log arrays hex-encoded (i.e pow difficulty)
• release v0.7.1

[codecov]

Codecov Report

Attention: Patch coverage is 56.00000% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 93.77%. Comparing base (16f3941) to head (f18ac34).

Files	Patch %	Lines
service/src/client.rs	50.00%	4 Missing ⚠️
src/prove.rs	25.00%	3 Missing ⚠️
service/src/service.rs	81.81%	2 Missing ⚠️
src/verification.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
- Coverage   94.05%   93.77%   -0.28%     
==========================================
  Files          26       26              
  Lines        3330     3344      +14     
==========================================
+ Hits         3132     3136       +4     
- Misses        198      208      +10     

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