Refactor parsers

[elpiel]

• Refactor of parsers to use &str instead of &[u8]
• parse_str & parse_bytes
• exporting modules and moving around structs and enums

Support for 2 new message types:

• BOD (untested)
• GBS (untested)

[codecov]

Codecov Report

Merging #51 (2d91068) into main (04aada1) will increase coverage by 2.91%.
The diff coverage is 74.87%.

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   82.64%   85.56%   +2.91%     
==========================================
  Files          15       23       +8     
  Lines        1268     1247      -21     
==========================================
+ Hits         1048     1067      +19     
+ Misses        220      180      -40     

Impacted Files	Coverage Δ
src/lib.rs	0.00% <ø> (-66.83%)	⬇️
src/sentences/bod.rs	0.00% <0.00%> (ø)
src/sentences/mod.rs	0.00% <0.00%> (-61.82%)	⬇️
src/error.rs	6.89% <6.89%> (ø)
src/sentences/gnss_type.rs	14.28% <14.28%> (ø)
src/sentences/gbs.rs	58.33% <58.33%> (ø)
src/sentences/faa_mode.rs	64.81% <64.81%> (ø)
src/parse.rs	82.35% <79.41%> (+19.11%)	⬆️
src/sentences/gga.rs	95.91% <80.00%> (ø)
src/sentences/gsv.rs	96.42% <80.00%> (+1.07%)	⬆️
... and 16 more

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[elpiel]

@Dushistov would you like to take a look at the changes?
In general, it's much cleaner and I'm planning to do the Iterator parser soon.
There isn't much benefit in parsing the data as bytes because in many cases we turn it back to &str and we know that NMEA 0183 sentences should be valid ASCII anyway, so the opposite parsing makes much more sense (&[u8] -> &str) only at the beginning of the parsing (i.e. using parse_bytes)