Implement rosbag API #3
Description
Connects to ros2/ros2#533
API shall be able to read and write ros 2 messages into a rosbag file.
It shall further be able to convert middleware dependent ros 2 messages into other encodings via available plugins.
In a second step these messages shall be recorded online and being published when the bag is getting replayed.
Todos:
- Basic interface for opening storage API and read/write data
- Plugin API for conversion API / loading message type_supports: see Convert function API for different serialization formats #11
- Transport layer for publishing data