Account for RAW4 datagrams in parsed to zarr method

[b-reyes]

In PR #794, it was found that RAW4 datagrams are not being correctly handled in the parsed to zarr (P2Z) method introduced in PR #774.

The issue was discovered after running the EK80 file raw4-D20220514-T172704.raw. The issue with this file is the RAW4 datagram produces receive ping data and the P2Z method did not adequately address this. To fix this issue, we just need to rectangularize this data and the method will work. However, after reviewing the data, it appears that this data can be quite large and it is probably best to directly write it to a zarr too.

Once the RAW4 datagrams are correctly accounted for in the P2Z method, we should then add raw4-D20220514-T172704.raw to the integration tests.