Add test for TEXT type with different sizes

[Tigrov]

Related PR

• Update doc of ColumnBuilder::text() db#910

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	#2

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.94%. Comparing base (0b031ba) to head (e55da74).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #370   +/-   ##
=========================================
  Coverage     98.94%   98.94%           
  Complexity      179      179           
=========================================
  Files            17       17           
  Lines           569      569           
=========================================
  Hits            563      563           
  Misses            6        6           

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