Styled string conversion

[kmvanbrunt]

Fixed a few issues related to converting strings to Text before rendering.
Previously we converted all non-Rich objects to a Text object. Now we only convert strings which contain ANSI styles.

Rich only looks for markup, emojis, and highlighting in strings. Therefore we were losing this capability since they had been converted to Text objects. Additionally, we lost pretty printing on objects like dictionaries because they also had been converted to Text by our code.

Finally, I fixed an issue with incorrect display widths of styled_strings in CompletionItems descriptions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.77%. Comparing base (c1af802) to head (93898d5).
⚠️ Report is 67 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1489   +/-   ##
=======================================
  Coverage   98.77%   98.77%           
=======================================
  Files          23       23           
  Lines        4911     4917    +6     
=======================================
+ Hits         4851     4857    +6     
  Misses         60       60           

Flag	Coverage Δ
unittests	98.77% <100.00%> (+<0.01%)	⬆️

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