Add ARP module

[lachrimae]

I'd like to parse ARP packets for Ethernet+IPv4. Might you be interested in merging this if I complete the implementation?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.69%. Comparing base (1d2be79) to head (cab1b5b).
Report is 488 commits behind head on master.

Additional details and impacted files

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##           master      #15   +/-   ##
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  Coverage   99.69%   99.69%           
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  Files          45       45           
  Lines       16320    16320           
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  Hits        16271    16271           
  Misses         49       49           

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[ravenexp]

Hi! I'm interested in using etherparse for parsing and building ARP packets.

My current implementation uses Ethernet2Header and a hand-coded ARP parser/builder.
This PR contains a higher quality implementation that I'd like to adopt.

I somewhat disagree on the implementation approach though: there is no such thing as "ARP header" according to RFC 826. ARP defines fixed-length Ethernet packets that have a very simple structure. Breaking it down further into "ARP header" and "ARP payload" seems artificial to me.

Should I try to submit an independent PR or are you rather interested in merging the current one?

[lachrimae]

@ravenexp I am pretty happy for you to submit your own version of the ARP module with the improvements you have in mind. I haven't heard back from the maintainer on this thread so I'm not sure what they think.

[JulianSchmid]

Closing this PR as ARP support was added with #103 and released with https://github.com/JulianSchmid/etherparse/releases/tag/v0.17.0 .