Reflect interface changes of server DB sharding

[humdrum]

What this PR does / why we need it:
iOS implementation for the corresponding JS PR

• Reflect interface changes of server DB sharding yorkie-js-sdk#726

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Additional documentation:

Checklist:

• Added relevant tests or not required
• Didn't break anything

[codecov]

Codecov Report

Attention: 60 lines in your changes are missing coverage. Please review.

Comparison is base (f1c18b3) 42.69% compared to head (64fd6a9) 42.58%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
Sources/API/V1/yorkie/v1/yorkie.pb.swift	0.00%	54 Missing ⚠️
Sources/Core/Client.swift	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
- Coverage   42.69%   42.58%   -0.11%     
==========================================
  Files         104      104              
  Lines       24216    24276      +60     
==========================================
  Hits        10338    10338              
- Misses      13878    13938      +60     

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[myupage]

Thank you