GVCP support

[tigercosmos]

Per #1321

This PR supported the GVCP protocol, including the GVCP request and GVCP acknowledgment.

Also, the PR added the most common commands of GVCP: Discovery command, ForceIP command, Read register Command, and Write register command.

[tigercosmos]

@seladb The PR is ready. Please take a look.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.68030% with 34 lines in your changes missing coverage. Please review.

Project coverage is 83.02%. Comparing base (a600a70) to head (b144e60). Report is 12 commits behind head on dev.

Files with missing lines	Patch %	Lines
Packet++/src/GvcpLayer.cpp	70.52%	25 Missing and 3 partials :warning:
Packet++/header/GvcpLayer.h	96.29%	6 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1357      +/-   ##
==========================================
+ Coverage   82.94%   83.02%   +0.08%     
==========================================
  Files         273      276       +3     
  Lines       46353    46799     +446     
  Branches     9642     9568      -74     
==========================================
+ Hits        38446    38856     +410     
+ Misses       7280     7083     -197     
- Partials      627      860     +233     

Flag	Coverage Δ
fedora39	74.60% <91.05%> (+0.04%)	:arrow_up:
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mingw32	70.29% <72.13%> (-1.17%)	:arrow_down:
mingw64	70.26% <72.13%> (-1.20%)	:arrow_down:
npcap	84.77% <86.69%> (-0.13%)	:arrow_down:
rhel94	74.40% <90.00%> (+0.06%)	:arrow_up:
ubuntu2004	57.71% <46.26%> (-0.20%)	:arrow_down:
ubuntu2004-zstd	57.83% <46.26%> (-0.22%)	:arrow_down:
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ubuntu2204-icpx	58.56% <72.95%> (+0.09%)	:arrow_up:
ubuntu2404	74.61% <91.32%> (+0.08%)	:arrow_up:
unittest	83.02% <93.68%> (+0.08%)	:arrow_up:
windows-2019	84.89% <86.69%> (-0.06%)	:arrow_down:
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xdp	49.48% <90.00%> (+0.19%)	:arrow_up:

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[tigercosmos]

Don't know why the fuzz tests failed?

[tigercosmos]

@seladb Reading your sample code, basically I got your intention. So "Discovery" and "ForceIP" have their own layer, and for other commands, they will fall back to general GVCPRequestLayer and GvcpAcknowledgeLayer. I don't see a problem for now, and I will try to refactor the PR based on this and see if I encounter any issues.

[seladb]

@seladb Reading your sample code, basically I got your intention. So "Discovery" and "ForceIP" have their own layer, and for other commands, they will fall back to general GVCPRequestLayer and GvcpAcknowledgeLayer. I don't see a problem for now, and I will try to refactor the PR based on this and see if I encounter any issues.

Yes, other messages should fall under GvcpRequestLayer or GvcpAckLayer. In that way we can create specific layers for more messages in the future