fix: parsing CDATA that has embedded XML doc

[muktihari]

A CDATA section is typically used to embed an XML document within another XML document: <![CDATA[<element>text</element>]]>, the parser should be able to parse <element>text</element> as the CharData.

Ref: https://www.ibm.com/docs/en/integration-bus/10.0?topic=messages-xmlnsc-working-cdata

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.65%. Comparing base (3d1a3e9) to head (39bdbbb).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   93.79%   95.65%   +1.85%     
==========================================
  Files           2        2              
  Lines         274      276       +2     
==========================================
+ Hits          257      264       +7     
+ Misses         12        8       -4     
+ Partials        5        4       -1     

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