Add basic exercising of rustls-graviola

[ctz]

Make a bunch of TLS connections against a peer that is using ring.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.77%. Comparing base (2ec4105) to head (1c54c7e).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   97.64%   98.77%   +1.12%     
==========================================
  Files         162      162              
  Lines       37109    37115       +6     
==========================================
+ Hits        36236    36659     +423     
+ Misses        873      456     -417     

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[codspeed-hq]

CodSpeed Performance Report

Merging #36 will not alter performance

_{Comparing jbp-exercise-tls (1c54c7e) with main (69b5a6e)}

Summary

✅ 126 untouched benchmarks