Extend tabs with styles

[willmcgugan]

The Text.extend_tabs method was previously not taking in to account the spans. Basically it would replace tabs with unstyled spaces. This resolves that issue by extending the style(s) on the tab to cover the new space characters

[codecov-commenter]

Codecov Report

Patch coverage: 94.73% and project coverage change: -0.03% ⚠️

Comparison is base (31c1fb6) 98.31% compared to head (d5b3282) 98.29%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3061      +/-   ##
==========================================
- Coverage   98.31%   98.29%   -0.03%     
==========================================
  Files          74       74              
  Lines        8016     8036      +20     
==========================================
+ Hits         7881     7899      +18     
- Misses        135      137       +2     

Flag	Coverage Δ
unittests	98.29% <94.73%> (-0.03%)	⬇️

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

Files Changed	Coverage Δ
rich/text.py	99.17% <94.73%> (-0.32%)	⬇️

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