Partkey Interface: Rename CompactCertificate to StateProof.

[winder]

Summary

Rename some fields.

Test Plan

N/A

[codecov-commenter]

Codecov Report

Merging #3182 (f8b056e) into feature/partkey (3c391eb) will decrease coverage by 0.02%.
The diff coverage is 96.55%.

@@                 Coverage Diff                 @@
##           feature/partkey    #3182      +/-   ##
===================================================
- Coverage            44.12%   44.09%   -0.03%     
===================================================
  Files                  394      394              
  Lines                87648    87648              
===================================================
- Hits                 38671    38649      -22     
- Misses               42885    42901      +16     
- Partials              6092     6098       +6     

Impacted Files	Coverage Δ
daemon/algod/api/server/v2/handlers.go	0.00% <0.00%> (ø)
data/account/participationRegistry.go	82.13% <100.00%> (ø)
network/wsPeer.go	69.86% <0.00%> (-3.21%)	⬇️
util/metrics/gauge.go	68.00% <0.00%> (-2.67%)	⬇️
util/metrics/counter.go	78.57% <0.00%> (-2.39%)	⬇️
txnsync/mainloop.go	85.91% <0.00%> (-1.41%)	⬇️
ledger/acctupdates.go	64.45% <0.00%> (-0.30%)	⬇️

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