Add support for string_255 type and fix discovery status memory leaks (#218)

* Support using string_225 template instance in python



* Fix DiscoveryStatus memory leak warnings



---------

Signed-off-by: Raul Sanchez-Mateos <raul@eprosima.com>
Co-authored-by: Raul Sanchez-Mateos Lizano <raul@eprosima.com>

Author: mergify[bot]

fastdds_python/src/swig/fastcdr/cdr/fixed_size_string.i

@@ -20,3 +20,6 @@
 %ignore eprosima::fastcdr::fixed_string::operator const char*() const;
 
 %include "fastcdr/cdr/fixed_size_string.hpp"
+
+// Define string_255 as a fixed_string<255>
+%template(string_255) eprosima::fastcdr::fixed_string<255>;

fastdds_python/src/swig/fastdds.i

@@ -168,6 +168,9 @@ namespace xtypes {
 %include "fastdds/rtps/common/SampleIdentity.i"
 %include "fastdds/rtps/common/WriteParams.i"
 %include "fastdds/rtps/builtin/data/ContentFilterProperty.i"
+%include "fastdds/rtps/reader/ReaderDiscoveryInfo.i"
+%include "fastdds/rtps/writer/WriterDiscoveryInfo.i"
+%include "fastdds/rtps/participant/ParticipantDiscoveryInfo.i"
 
 %include "fastdds/dds/common/InstanceHandle.i"
 %include "fastdds/dds/core/ReturnCode.i"