feat: add support for ais msg type 16 #18
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added support for parsing AIS message type 16, following this documentation AIVDM/AIVDO protocol decoding. I tested on three message samples: one from the gpsd test file, an example from Arundale AIS, and a sample from the pyais library.
The implementation of this type consider an optional second station assignment. If the bitstream contains at least 52 bits after parsing the first station, the code proceeds to handle the second station. Otherwise, it assumes the message contains a single station assignment.
Here is a screenshot of testing a sample of messages with both pyais and ais rust after adding support for type 16
