ledger: new db methods to abstract queries needed by the deltas (9 of N)

[icorderi]

Summary

This PR creates a few more methods needed by the deltas.

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
• part 5 - ledger: move catchpoint staging into a storage package (5 of N) #4836
• part 6 - ledger: move blockdb into a storage package (6 of N) #4841
• part 7 - ledger: move migrations into a storage package (7 of N) #4846
• part 8 - ledger: move blockdb tests into a storage package (8 of N) #4860

What remains to be moved out:

• 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 #4864 (a0b66eb) into master (8515e46) will decrease coverage by 0.05%.
The diff coverage is 19.14%.

@@            Coverage Diff             @@
##           master    #4864      +/-   ##
==========================================
- Coverage   53.14%   53.09%   -0.06%     
==========================================
  Files         427      427              
  Lines       54064    54080      +16     
==========================================
- Hits        28732    28713      -19     
- Misses      23068    23102      +34     
- Partials     2264     2265       +1     

Impacted Files	Coverage Δ
ledger/store/accountsV2.go	15.95% <2.77%> (-1.64%)	⬇️
ledger/accountdb.go	76.47% <72.72%> (+0.41%)	⬆️
network/wsPeer.go	67.06% <0.00%> (-2.39%)	⬇️
crypto/merkletrie/trie.go	66.42% <0.00%> (-2.19%)	⬇️
crypto/merkletrie/node.go	91.62% <0.00%> (-1.87%)	⬇️
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
data/transactions/verify/txn.go	73.61% <0.00%> (-0.86%)	⬇️
ledger/acctupdates.go	68.99% <0.00%> (-0.25%)	⬇️
network/wsNetwork.go	64.92% <0.00%> (+0.17%)	⬆️
catchup/service.go	69.32% <0.00%> (+0.24%)	⬆️
... and 2 more

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[brianolson]

LGTM