Implement Destination Unreachable for ICMPv6

[plumenator]

Co-authored-by: @Adenylatcyclase

Description

Fixes # (issue) - if applicable

Type of change

• Bug fix
• New feature
• New protocol
• Breaking change
• Documentation update

Checklist

• Associated tests
• Associated documentation

We based it on Time Exceeded, pretty much copy pasted and renamed identifiers. 😁
This should tick one box off #105

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #128 (51bc0e0) into master (e4f542b) will decrease coverage by 0.01%.
The diff coverage is 68.65%.

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
- Coverage   68.57%   68.55%   -0.02%     
==========================================
  Files          65       66       +1     
  Lines        5906     5973      +67     
==========================================
+ Hits         4050     4095      +45     
- Misses       1856     1878      +22     

Impacted Files	Coverage Δ
core/src/packets/icmp/v6/mod.rs	79.52% <ø> (ø)
...ore/src/packets/icmp/v6/destination_unreachable.rs	68.65% <68.65%> (ø)
core/src/testils/proptest/strategy.rs	82.24% <0.00%> (-0.47%)	⬇️

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[zeeshanlakhani]

@plumenator @Adenylatcyclase very cool to see this. Before @drunkirishcoder and I give it a good review, can you rebase and bring in the latest changes from the main branch? We changed our error library recently.

[plumenator]

Done!

[zeeshanlakhani]

Thanks @plumenator @Adenylatcyclase. We'll take a gander this week.

[drunkirishcoder]

thank you for the contribution! good work.

[zeeshanlakhani]

Great work and for keeping up w/ our documentation approach too!