feat(core-manager): implement database query support

[sebastijankuzner]

Summary

This PR introduces possibility to query watcher sqlite database including querying JSON objects with nested structure. All query parameters have prefix $.

Symbol	Description
$limit	Limit database result. Placed in the query object root.
$offset	Offset database result. Placed in the query object root.
$eq	Equal.
$ne	Not equal.
$like	Like.
$lt	Less than.
$lte	Less than or equal.
$gt	Greater than.
$gte	Greater than or equal.

Example:

{ "$limit": 100, "$offset": 0, "data": { "value": { "username": "genesis_9" } } }

Load top 100 results with 0 offset where data JOSN object has value.username propery equal to "genesis_9".

Checklist

• Tests
• Ready to be merged

[codecov]

Codecov Report

Merging #3780 into develop will increase coverage by 1.31%.
The diff coverage is 77.14%.

@@             Coverage Diff             @@
##           develop    #3780      +/-   ##
===========================================
+ Coverage    89.40%   90.71%   +1.31%     
===========================================
  Files          615      615              
  Lines        13558    13585      +27     
  Branches      1527     1535       +8     
===========================================
+ Hits         12121    12324     +203     
+ Misses         313      139     -174     
+ Partials      1124     1122       -2     

Impacted Files	Coverage Δ
packages/core-manager/src/database-service.ts	83.60% <76.47%> (-4.63%)	⬇️
...ges/core-manager/src/actions/watcher-get-events.ts	100.00% <100.00%> (ø)
packages/core-database/src/utils/query-helper.ts	100.00% <0.00%> (+2.04%)	⬆️
...s/core-database/src/utils/snake-naming-strategy.ts	81.81% <0.00%> (+9.09%)	⬆️
packages/core-database/src/utils/transform.ts	93.75% <0.00%> (+31.25%)	⬆️
...core-database/src/repositories/round-repository.ts	100.00% <0.00%> (+57.14%)	⬆️
...atabase/src/repositories/transaction-repository.ts	94.44% <0.00%> (+75.00%)	⬆️
...e-database/src/repositories/abstract-repository.ts	85.10% <0.00%> (+76.59%)	⬆️
...core-database/src/repositories/block-repository.ts	93.33% <0.00%> (+83.33%)	⬆️
...rc/migrations/20190307000000-drop-wallets-table.ts	100.00% <0.00%> (+100.00%)	⬆️
... and 19 more

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