v0.3

Major improvements:

• Enhanced code quality with comprehensive refactoring
  • Improved modern C++17 usage throughout the codebase
  • Reduced code complexity and technical debt
• Memory safety and robustness improvements
  • Fixed critical memory safety issue in DTL connection management
  • Fixed race condition in Engine creation
  • Plugged memory leaks
• Major refactoring with improved memory management, encapsulation, and move-only semantics
• Improved CI/CD infrastructure
  • Added Valgrind and sanitizer checks (AddressSanitizer, UndefinedBehaviorSanitizer)
  • Enhanced test coverage and validation
• Comprehensive proofread of the documentation

API Changes:

• DTL::get_stream_by_name_or_null() renamed to DTL::get_stream_by_name()
  Returns std::optional<std::shared_ptr> instead of raw pointer
  Python: dtl.get_stream_by_name() now returns None if stream not found
• Metadata management transferred from Engine to Stream
  Stream::get_metadata_file_name() replaces Engine::get_metadata_file_name()
  Python: stream.metadata_file_name replaces engine.metadata_file_name
• Stream method chaining improvements
  set_engine_type() and set_transport_method() now return Stream& instead of Stream*
  Enables cleaner fluent interface: stream.set_engine_type(...).set_transport_method(...)
• DTL::create() now accepts std::string_view and has empty default parameter
• String parameters changed to std::string_view for better performance:
  • DTL::add_stream(), DTL::get_stream_by_name()
  • Stream and Variable constructors and methods
• get_engine_type_str() and get_transport_method_str() now return std::optional<const char*>