ledger: POC of simpler lookupLatest #3747
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Summary
POC of a simpler lookupLatest method, easier to read without whitespace diffs: https://github.com/algorand/go-algorand/pull/3747/files?diff=unified&w=1
Since REST API is the only remaining user of LookupLatest, this is a POC to let it acquire the RLock for the entire call, to reduce complexity while accessing through multiple account+resource caches, along with potential DB queries to two tables.
Test Plan
All existing tests should pass.