Implement BytesCData::escaped() fn

[Turbo87]

This PR should resolve #831 by implementing an escaped() fn on the BytesCData struct as suggested in #831 (comment).

I opted for keeping the new() fn around and introducing another function instead because the new() fn is used in various places in the quick-xml test suite and I didn't want to break anything. This should also allow us to ship this PR in a non-breaking version release since the existing new() fn keeps working as-is. We could consider deprecating the new() fn though to make it easier for users to understand that they should use escaped() instead. We could also add a raw() fn as an alias for new() if we would like to keep the behavior for some users while still deprecating new().

Related:

• ]]> in CDATA is not escaped #831
• ]]> in CDATA is not escaped rust-syndication/rss#173
• Fix ]]> escaping in CDATA sections rust-syndication/rss#174
• Fix CDATA handling #374

/cc @Mingun

[Mingun]

Thanks for PR. Some minor improvements can be made here and there, and also please add changelog entry. Use link to the issue #831 in section for issues and brief description about added method in New Features section. See the other issues in the file for an example.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 25 lines in your changes missing coverage. Please review.

Project coverage is 60.23%. Comparing base (a9391f3) to head (be09876).
Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
src/events/mod.rs	0.00%	25 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #832      +/-   ##
==========================================
+ Coverage   60.21%   60.23%   +0.01%     
==========================================
  Files          41       41              
  Lines       16021    16029       +8     
==========================================
+ Hits         9647     9655       +8     
  Misses       6374     6374              

Flag	Coverage Δ
unittests	60.23% <0.00%> (+0.01%)	⬆️

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[Turbo87]

thanks for the quick review. I just pushed a couple of commits and I think I addressed all of the comments :)

[Mingun]

Good. Only add changelog entry please.

[Turbo87]

Only add changelog entry please.

done!

[Mingun]

In the end I actually rewrite the whole implementation to use memchr. I think, it is now more straightforward and easy for understanding. But thanks anyway for your PR! The changes will be released soon in 0.37.1