feat: add tab_size option to use N spaces instead of tabs

[bartveneman]

closes #124

[codecov]

Bundle Report

Changes will increase total bundle size by 189 bytes (1.04%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
formatCss-esm	6.96kB	189 bytes (2.79%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: formatCss-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
format-*.js	189 bytes	6.96kB	2.79%

Files in format-*.js:

• ./index.js → Total Size: 16.82kB

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6af7056) to head (df4c089).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #125   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          583       598   +15     
=========================================
+ Hits           583       598   +15     

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