More testing

[ADBond]

Cover a few edge cases in tests.

More handling of types when registering pandas frames in ClickhouseServerAPI.

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.59%. Comparing base (44e4765) to head (b753dcc).
Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
splinkclickhouse/clickhouse_server/database_api.py	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   90.48%   95.59%   +5.10%     
==========================================
  Files          12       12              
  Lines         431      431              
  Branches       32       30       -2     
==========================================
+ Hits          390      412      +22     
+ Misses         24       12      -12     
+ Partials       17        7      -10     

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