(wip) Iterator based parsing

[trkohler]

This is work in progress, but was published to receive an initial feedback.

connect: #53

[codecov]

Codecov Report

❌ Patch coverage is 92.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.84%. Comparing base (afb133b) to head (ca4dc7a).
⚠️ Report is 39 commits behind head on main.

Files with missing lines	Patch %	Lines
src/stream.rs	92.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
+ Coverage   78.67%   78.84%   +0.17%     
==========================================
  Files          39       40       +1     
  Lines        1449     1475      +26     
==========================================
+ Hits         1140     1163      +23     
- Misses        309      312       +3     

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[CramBL]

May I suggest that you take a look at the parser implementation in ublox-rs: https://github.com/ublox-rs/ublox/blob/master/ublox/src/parser.rs

It is also a streaming parser, and it has all the features you could want:

• no_std
• Zero copy
• Uses a two-segment scatter-gather view to avoid memcpys (would fit perfectly for NMEA)
• Generic over all the major ublox protocol versions
• Generic over buffer size and whether its heap or entirely stack allocated
• Ergonomic instantiation via a compile-time builder pattern

I'm not saying your parser needs to have all these features right away, but all these features (obviously with NMEA versions instead of ublox protocol versions) are generally very useful for a streaming parser.