chore: simplify the datagen API

[westonpace]

Very minor change but one that has been annoying me for a while. The datagen allows columns to be specified with or without a name ("without a name" means one is automatically generated based on the column index). If a name is specified it must be a String. The vast majority of usage does specify a name and provides it as a &str. As a result we have a lot of boilerplate Some("foo".to_string()) that I would like to avoid.

To generate a column without a name use the function anon_col.
When generating a column with a name the name is now provided as impl Into<String> instead of Option<String>.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.86%. Comparing base (9ddcadd) to head (460ba3c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2288   +/-   ##
=======================================
  Coverage   80.85%   80.86%           
=======================================
  Files         190      190           
  Lines       55907    55840   -67     
  Branches    55907    55840   -67     
=======================================
- Hits        45206    45157   -49     
+ Misses       8165     8164    -1     
+ Partials     2536     2519   -17     

Flag	Coverage Δ
unittests	80.86% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.