Give more informative errors for unsupported dtypes

[michaelosthege]

Helps to diagnose which variables or stats cause problems when initializing a ClickHouseRun.

[codecov-commenter]

Codecov Report

Base: 96.58% // Head: 96.59% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (36f76c6) compared to base (8e845aa).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   96.58%   96.59%   +0.01%     
==========================================
  Files           7        7              
  Lines         585      587       +2     
==========================================
+ Hits          565      567       +2     
  Misses         20       20              

Impacted Files	Coverage Δ
mcbackend/backends/clickhouse.py	100.00% <100.00%> (ø)

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