ledger: fixes to store interface after kv merge

[icorderi]

Summary

Quick fix of some missing interface changes that were in master but not on PR #5488

Test Plan

Existing tests.

[AlgoAxel]

My understanding is that interfaces changed and were not noticed when the previous change (#5534 and/or #5488 ?) was made.

1. The title of this PR does not match the branch name or the description, isn't this "fix: interface changes in store interface"?

2. You have a code generation error in the store package, regarding msgpk. @iansuvak may have some insight.

[codecov]

Codecov Report

Merging #5607 (9412c4d) into master (1d1fe0f) will decrease coverage by 0.83%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #5607      +/-   ##
==========================================
- Coverage   55.79%   54.97%   -0.83%     
==========================================
  Files         446      460      +14     
  Lines       63490    64441     +951     
==========================================
+ Hits        35425    35427       +2     
- Misses      25694    26643     +949     
  Partials     2371     2371              

Files Changed	Coverage Δ
...r/store/trackerdb/generickv/accounts_ext_reader.go	0.00% <0.00%> (ø)
...r/store/trackerdb/generickv/accounts_ext_writer.go	0.00% <0.00%> (ø)
...edger/store/trackerdb/generickv/accounts_reader.go	0.00% <0.00%> (ø)
...edger/store/trackerdb/generickv/accounts_writer.go	0.00% <0.00%> (ø)
ledger/store/trackerdb/generickv/catchpoint.go	0.00% <0.00%> (ø)
ledger/store/trackerdb/generickv/init_accounts.go	0.00% <0.00%> (ø)
ledger/store/trackerdb/generickv/migrations.go	0.00% <0.00%> (ø)
...store/trackerdb/generickv/onlineaccounts_reader.go	0.00% <0.00%> (ø)
...store/trackerdb/generickv/onlineaccounts_writer.go	0.00% <0.00%> (ø)
ledger/store/trackerdb/generickv/reader.go	0.00% <0.00%> (ø)
... and 4 more

... and 14 files with indirect coverage changes

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