chore: Improvements to Block Footer and Proof Support

[Nana-EC]

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[Nana-EC]

Leaving in draft until @AlfredoG87 's PR #1891 goes in.
I can more easily rebase my PR to add some tests and other support I found useful here.
More important for verification logic to go in sooner

[codecov]

Codecov Report

❌ Patch coverage is 38.88889% with 11 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...cation/session/impl/ExtendedMerkleTreeSession.java	38.88%	8 Missing and 3 partials ⚠️

❌ Your patch check has failed because the patch coverage (38.88%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

@@             Coverage Diff              @@
##               main    #1891      +/-   ##
============================================
- Coverage     79.48%   78.91%   -0.58%     
- Complexity     1193     1200       +7     
============================================
  Files           128      130       +2     
  Lines          5684     5781      +97     
  Branches        610      618       +8     
============================================
+ Hits           4518     4562      +44     
- Misses          887      934      +47     
- Partials        279      285       +6     

Files with missing lines	Coverage Δ	Complexity Δ
...cation/session/impl/ExtendedMerkleTreeSession.java	71.18% <38.88%> (-15.49%)	15.00 <0.00> (+13.00)	⬇️

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