Added DG routes for feature parity. Added EventSubscriptionV2 async.

[PetrVakulenko]

By creating this pull request, I confirm the following:

• I have read the CONTRIBUTING document.
• My change requires a change to the documentation.
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I updated the CHANGELOG.

Types of changes:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Link to issue (if exists):

Small description of changes:

Thanks

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.59%. Comparing base (4afb90e) to head (a9a6412).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #184      +/-   ##
===========================================
+ Coverage    83.50%   83.59%   +0.09%     
===========================================
  Files           91       92       +1     
  Lines         1394     1402       +8     
  Branches       174      174              
===========================================
+ Hits          1164     1172       +8     
  Misses         187      187              
  Partials        43       43              

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