Algod: changed state proof message to no longer be embedded

[almog-t]

Summary

Changes to some API types - extracted StateProofMessage from StateProof, since SDK code generation does not currently behave as expected when processing embedded types.

Test Plan

[codecov]

Codecov Report

Merging #4395 (cc15c47) into master (701d431) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4395      +/-   ##
==========================================
- Coverage   55.63%   55.59%   -0.04%     
==========================================
  Files         403      403              
  Lines       50805    50805              
==========================================
- Hits        28263    28246      -17     
- Misses      20148    20167      +19     
+ Partials     2394     2392       -2     

Impacted Files	Coverage Δ
catchup/service.go	68.14% <0.00%> (-1.98%)	⬇️
ledger/tracker.go	78.63% <0.00%> (-1.71%)	⬇️
util/db/dbutil.go	49.09% <0.00%> (-1.22%)	⬇️
data/abi/abi_type.go	87.67% <0.00%> (-0.95%)	⬇️
ledger/acctupdates.go	69.92% <0.00%> (-0.61%)	⬇️
network/requestTracker.go	71.12% <0.00%> (-0.44%)	⬇️
network/wsPeer.go	67.67% <0.00%> (ø)
data/transactions/verify/txn.go	44.73% <0.00%> (+0.87%)	⬆️
cmd/algoh/blockWatcher.go	80.95% <0.00%> (+3.17%)	⬆️

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