Enable users to choose which dispatchers Client and Document should use

[skhugh]

No description provided.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (47b2323) 79.62% compared to head (b276621) 79.62%.

Files	Patch %	Lines
yorkie/src/main/kotlin/dev/yorkie/core/Client.kt	85.71%	0 Missing and 1 partial ⚠️
...ie/src/main/kotlin/dev/yorkie/document/Document.kt	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
- Coverage   79.62%   79.62%   -0.01%     
==========================================
  Files          63       63              
  Lines        3843     3852       +9     
  Branches      601      603       +2     
==========================================
+ Hits         3060     3067       +7     
  Misses        459      459              
- Partials      324      326       +2     

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