Prepare implementation for DPT (Depth of Water) messages

[trkohler]

connect: #54

[elpiel]

I see you made a typo, this is why you get a name conflict.
The type of the sentence is DPT, instead of DBT. If you use DPT there will be no conflict.

[trkohler]

tests currently not passing because I need to clarify how to handle those cases: $SDDPT,2.4,,*53 and $SDDPT,15.2,0.5,*6C (with trailing commas)

[codecov]

Codecov Report

Attention: Patch coverage is 82.85714% with 6 lines in your changes missing coverage. Please review.

Project coverage is 77.98%. Comparing base (5675768) to head (604bfa1).

Files with missing lines	Patch %	Lines
src/sentences/dpt.rs	83.33%	5 Missing ⚠️
src/parser.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
+ Coverage   77.93%   77.98%   +0.05%     
==========================================
  Files          37       38       +1     
  Lines        1405     1440      +35     
==========================================
+ Hits         1095     1123      +28     
- Misses        310      317       +7     

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