Implement `PGRMZ` support

[Turbo87]

$PGRMZ is used by a lot of gliding computers like the https://gliding.lxnav.com/products/lx9000/ to transmit the current barometric altitude.

This PR implements basic support for it. It is currently implemented to output the raw altitude in feet without any conversions.

[elpiel]

Great progress for the support of RMZ messages.

There are a few points that need addressing:

• [x] Add new sentence type to the fn parse_str()
• [x] Check not only the message_id (RMZ) but also the talker_id, it should be PG. I think we can create an UnknownTalkerId error and pass a custom expected value (&'a [&'a str]) for PG
• [x] It would be great to also add tests regarding this case (talker_id != PG should give out an error)

[codecov[bot]]

Codecov Report

Base: 76.80% // Head: 76.76% // Decreases project coverage by -0.03% :warning:

Coverage data is based on head (f65c8cc) compared to base (03695a6). Patch coverage: 75.00% of modified lines in pull request are covered.

:exclamation: Current head f65c8cc differs from pull request most recent head 7b0ef1f. Consider uploading reports for the commit 7b0ef1f to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #59 +/- ## ========================================== - Coverage 76.80% 76.76% -0.04% ========================================== Files 20 21 +1 Lines 776 792 +16 ========================================== + Hits 596 608 +12 - Misses 180 184 +4 ``` | [Impacted Files](https://codecov.io/gh/AeroRust/nmea/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust) | Coverage Δ | | |---|---|---| | [src/parser.rs](https://codecov.io/gh/AeroRust/nmea/pull/59/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust#diff-c3JjL3BhcnNlci5ycw==) | `79.91% <ø> (ø)` | | | [src/sentences/mod.rs](https://codecov.io/gh/AeroRust/nmea/pull/59/diff?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/sentences/rmz.rs](https://codecov.io/gh/AeroRust/nmea/pull/59/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AeroRust#diff-c3JjL3NlbnRlbmNlcy9ybXoucnM=) | `75.00% <75.00%> (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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[Turbo87]

• Add new sentence type to the fn parse()

tbh I'm not convinced that we should be merging this data with the rest in the parse() function. the PGRMZ sentence usually contains a barometric or pressure altitude, while the regular NMEA sentences contain GPS altitudes, which can often have significant offsets due to the current weather situation. if we would merge them and pretend like they contain the same information then the altitude will regularly jump all over the place.

[elpiel]

@Turbo87 I was referring to the parse_str(I made a typo) which is able to parse all types of sentences, not like the NMEA::parse():

https://github.com/AeroRust/nmea/blob/03695a6d0dacdf39f16ba83338d040418ef6fd54/src/parse.rs#L134

[Turbo87]

Ah, I see. That makes sense :)

I'll update the PR in the next couple of days once EuroRust is over

[elpiel]

Awesome, thank you 🥳

[elpiel]

Thank you 🥳