Declare to string method for GenericDataType and AmlipIdDataType

[irenebm]

Added a __str__() method to AmlipIdDataType and GenericDataType. This method returns a string representation of the object by calling its to_string() method.

Previously, the default representation was generic and uninformative:

<amlip_swig.AmlipIdDataType; proxy of <Swig Object of type 'eprosima::amlip::types::AmlipIdDataType *' at 0x74eabaf50960> >

With the addition of __str__(), the output becomes descriptive:

AMLMainNode.89.8e.a5.7f

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.81%. Comparing base (583c04f) to head (75e21a7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
- Coverage   51.04%   49.81%   -1.23%     
==========================================
  Files          64       64              
  Lines        3013     3013              
  Branches     1112     1112              
==========================================
- Hits         1538     1501      -37     
- Misses        653      682      +29     
- Partials      822      830       +8     

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