fix: Trim ".0" postfix when converting Float to Utf8

[MazterQyou]

This PR alters the way Float types are converted to Utf8, trimming the ".0" postfix if a float has no fractional part. This is in accordance with how PostgreSQL converts floats to text, and does not affect Decimal (numeric) which retain their fractional part even if it is 0.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.80%. Comparing base (9f2e286) to head (ff899fb).

❗ Current head ff899fb differs from pull request most recent head 8a5e7e0. Consider uploading reports for the commit 8a5e7e0 to get more accurate results

Additional details and impacted files

@@               Coverage Diff                @@
##           cubesql-v11.1.0      #32   +/-   ##
================================================
  Coverage            82.80%   82.80%           
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  Files                  190      190           
  Lines                55376    55389   +13     
================================================
+ Hits                 45852    45867   +15     
+ Misses                9524     9522    -2     

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