init: fast query DB

[emidev98]

Implementation

This solution is based on the previous implementation from Mantlemint, StreamingServices and the possibility of setting a query database in a CosmosSDK app. Querying data from the IAVL CosmosSDK can be slow because the checks that have to be done, the MerkleTree re-balances and different write-read processes that are executed in the node. To data access we decided to stream stores data each time a block is commited to a new LevelDB database with multithreading optimizations and without fraudproof-checks because the block is already validated before being commited.

Downsides

There are two main downsides for this implementation, (1) the data will be duplicated if old history of IAVL node is not deleted and (2) the data in this DB does not check merkle tree validity (because there is no merkle tree) so you have to trust the node provider that didn't manipulated the data.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (feat/fast_db@2cfffef). Click here to learn what that means.

Additional details and impacted files

@@               Coverage Diff               @@
##             feat/fast_db     #229   +/-   ##
===============================================
  Coverage                ?   69.92%           
===============================================
  Files                   ?       45           
  Lines                   ?     2108           
  Branches                ?        0           
===============================================
  Hits                    ?     1474           
  Misses                  ?      466           
  Partials                ?      168