ledger: move catchpoint staging into a storage package (5 of N)

[icorderi]

Summary

Continue moving methods out of accountdb.go.
This PR particularly moves "catchpoint staging".

Previous parts of this refactor:

• part 1 - ledger: move pieces of accountdb.go into a storage package #4776
• part 2 - ledger: move catchpoint sql code into storage package #4813
• part 3 - ledger: move non-lookup methods into a storage package #4830
• part 4 - ledger: move catchpoint related methods into a storage package #4835

What remains to be moved out:

• setup stuff
  • table/index creations
  • table deletions
  • migrations
• iterators
  • orderedAccountsIter
  • catchpointPendingHashesIterator
• deltas
  • accountsLoadOld and resourcesLoadOld have a couple queries that we might want to move out to avoid pulling all the deltas into store

Test Plan

Existing tests.

[codecov]

Codecov Report

Merging #4836 (d292ce5) into master (a00e8a5) will decrease coverage by 0.14%.
The diff coverage is 20.60%.

@@            Coverage Diff             @@
##           master    #4836      +/-   ##
==========================================
- Coverage   53.54%   53.39%   -0.15%     
==========================================
  Files         422      422              
  Lines       53852    53858       +6     
==========================================
- Hits        28834    28758      -76     
- Misses      22697    22805     +108     
+ Partials     2321     2295      -26     

Impacted Files	Coverage Δ
ledger/store/accountsV2.go	4.76% <0.00%> (+0.02%)	⬆️
ledger/store/catchpoint.go	0.00% <0.00%> (ø)
ledger/accountdb.go	69.23% <63.33%> (+0.71%)	⬆️
ledger/catchupaccessor.go	64.70% <64.70%> (+0.57%)	⬆️
network/wsPeer.go	68.97% <0.00%> (-0.72%)	⬇️
ledger/acctupdates.go	69.34% <0.00%> (-0.25%)	⬇️
network/wsNetwork.go	64.74% <0.00%> (-0.18%)	⬇️
data/transactions/verify/txn.go	73.61% <0.00%> (ø)
ledger/testing/randomAccounts.go	56.61% <0.00%> (ø)
... and 2 more

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