support LowCardinality(String) for auto result

[develar]

Support LowCardinality(String) for auto result. Test modified also.

[codecov]

Codecov Report

Merging #79 (243df99) into main (c078927) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   82.82%   82.86%   +0.04%     
==========================================
  Files         116      116              
  Lines        4936     4944       +8     
==========================================
+ Hits         4088     4097       +9     
+ Misses        663      662       -1     
  Partials      185      185              

Impacted Files	Coverage Δ
proto/col_auto.go	85.29% <100.00%> (+8.37%)	⬆️

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