Remove StreamHandlerError implementations

[swift-kim]

This reverts #455.

The extended classes generate compile errors on Flutter 3.10 because they use the StreamHandlerError constructor. The constructor takes std::unique_ptr&& instead of a plain pointer since Flutter 3.10.

src/messageport_tizen_plugin.cc:56:9: error: no matching constructor for initialization of 'FlStreamHandlerError' (aka 'StreamHandlerError<flutter::EncodableValue>')
        FlStreamHandlerError(error_code_, error_message_, error_details) {}
        ^                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/swift/Git/flutter-tizen/flutter/bin/cache/artifacts/engine/tizen-common/cpp_client_wrapper/include/flutter/event_stream_handler.h:23:3: note: candidate constructor not
viable: no known conversion from 'const flutter::EncodableValue *' to 'std::unique_ptr<EncodableValue>' for 3rd argument
  StreamHandlerError(const std::string error_code,
  ^

[swift-kim]

@bbrto21 @JSUYA This is one of prerequisites for flutter-tizen/flutter-tizen#497. Please review ASAP.

[bbrto21]

LGTM
PS. Sorry for late review.