support handshake CLIENT_CONNECT_WITH_DB

[TennyZhuang]

No description provided.

[TennyZhuang]

I will add some tests later

[codecov]

Codecov Report

❌ Patch coverage is 41.50943% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.27%. Comparing base (7bb7c06) to head (e254181).
⚠️ Report is 199 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib.rs	20.00%	20 Missing ⚠️
src/commands.rs	60.71%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   81.65%   81.27%   -0.39%     
==========================================
  Files          10       10              
  Lines        2121     2152      +31     
==========================================
+ Hits         1732     1749      +17     
- Misses        389      403      +14     

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