Add VHW sentence parser

[ekuinox]

54 Implements parser for VHW sentence.

Different definitions seem to exist, but for the time being, the implementation follows gpsd.

[GLOBALSAT] describes a different format in which the first three fields are water-temperature measurements. It’s not clear which is correct.

From https://gpsd.gitlab.io/gpsd/NMEA.html#_vhw_water_speed_and_heading

[codecov[bot]]

Codecov Report

Patch coverage: 95.83% and project coverage change: +0.33 :tada:

Comparison is base (750e0a9) 80.39% compared to head (c0139e5) 80.72%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #84 +/- ## ========================================== + Coverage 80.39% 80.72% +0.33% ========================================== Files 29 30 +1 Lines 1076 1100 +24 ========================================== + Hits 865 888 +23 - Misses 211 212 +1 ``` | [Impacted Files](https://codecov.io/gh/AeroRust/nmea/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust) | Coverage Δ | | |---|---|---| | [src/lib.rs](https://codecov.io/gh/AeroRust/nmea/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust#diff-c3JjL2xpYi5ycw==) | `0.00% <ø> (ø)` | | | [src/parser.rs](https://codecov.io/gh/AeroRust/nmea/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust#diff-c3JjL3BhcnNlci5ycw==) | `77.30% <0.00%> (-0.30%)` | :arrow_down: | | [src/sentences/mod.rs](https://codecov.io/gh/AeroRust/nmea/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust#diff-c3JjL3NlbnRlbmNlcy9tb2QucnM=) | `0.00% <ø> (ø)` | | | [src/parse.rs](https://codecov.io/gh/AeroRust/nmea/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust#diff-c3JjL3BhcnNlLnJz) | `71.95% <100.00%> (+0.70%)` | :arrow_up: | | [src/sentences/vhw.rs](https://codecov.io/gh/AeroRust/nmea/pull/84?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust#diff-c3JjL3NlbnRlbmNlcy92aHcucnM=) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust)

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[elpiel]

Thank you for your PR!