✨ Add new SyncEngine, support async and sync code

[tiangolo]

✨ Add new SyncEngine, support async and sync code

Original at art049#225

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@623fa27). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #2   +/-   ##
=========================================
  Coverage          ?   99.94%           
=========================================
  Files             ?       38           
  Lines             ?     3374           
  Branches          ?      477           
=========================================
  Hits              ?     3372           
  Misses            ?        1           
  Partials          ?        1           

Flag	Coverage Δ
tests-3.6-4-standalone	99.70% <0.00%> (?)
tests-3.6-4.2-standalone	99.70% <0.00%> (?)
tests-3.6-4.4-standalone	99.70% <0.00%> (?)
tests-3.7-4-standalone	99.55% <0.00%> (?)
tests-3.7-4.2-standalone	99.55% <0.00%> (?)
tests-3.7-4.4-standalone	99.55% <0.00%> (?)
tests-3.8-4-replicaSet	98.28% <0.00%> (?)
tests-3.8-4-standalone	99.49% <0.00%> (?)
tests-3.8-4.2-sharded	98.28% <0.00%> (?)
tests-3.8-4.2-standalone	99.49% <0.00%> (?)
tests-3.8-4.4-standalone	99.49% <0.00%> (?)
tests-3.9-4-standalone	99.37% <0.00%> (?)
tests-3.9-4.2-standalone	99.37% <0.00%> (?)
tests-3.9-4.4-standalone	99.37% <0.00%> (?)

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