Implement c2sp.org/tlog-proof

[Hayden-IO]

This adds a new struct that represents the newly added tlog-proof C2SP spec.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.26%. Comparing base (fa00c16) to head (6b2211e).
⚠️ Report is 141 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #228      +/-   ##
==========================================
- Coverage   82.57%   77.26%   -5.32%     
==========================================
  Files           5        7       +2     
  Lines         241      431     +190     
==========================================
+ Hits          199      333     +134     
- Misses         30       55      +25     
- Partials       12       43      +31     

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