Rename Ace to CodeEditor

[philippjfr]

As discussed in #4460

[codecov]

Codecov Report

Merging #4627 (1ccd0aa) into main (a5c0c1e) will decrease coverage by 9.88%.
The diff coverage is 94.11%.

@@            Coverage Diff             @@
##             main    #4627      +/-   ##
==========================================
- Coverage   83.15%   73.27%   -9.88%     
==========================================
  Files         260      260              
  Lines       37151    37159       +8     
==========================================
- Hits        30894    27230    -3664     
- Misses       6257     9929    +3672     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	73.27% <94.11%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
panel/config.py	67.28% <ø> (ø)
panel/tests/test_docs.py	35.00% <0.00%> (ø)
panel/tests/widgets/test_codeeditor.py	100.00% <100.00%> (ø)
panel/widgets/__init__.py	100.00% <100.00%> (ø)
panel/widgets/codeeditor.py	93.02% <100.00%> (ø)

... and 48 files with indirect coverage changes

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