Make `iceoryx2-bb-container` public API

[elfenpiff]

(Code) Example Of Cumbersome API

For more advanced data types, those crates become necessary. Therefore, it should be a public API.

ToDo

• [x] Complete developer documentation
• [x] Add doc examples for all use cases
• [x] Check test coverage
• [x] All error enums must implement std::error::Error
• [x] Adjust complex_data_type example