iface: rename IpPacket to Packet

[thvdveld]

IpPacket/Ipv6Packet/Ipv4Packet were already defined in src/wire/*. It is confusing to use them together with the version in src/iface/. In some cases the compiler or clippy complained about ambiguity.

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (c647a32) 79.74% compared to head (ca755d7) 79.74%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/iface/interface/mod.rs	27.77%	13 Missing ⚠️
src/iface/packet.rs	66.66%	2 Missing ⚠️
src/iface/interface/ipv4.rs	90.90%	1 Missing ⚠️
src/iface/interface/ipv6.rs	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #873      +/-   ##
==========================================
- Coverage   79.74%   79.74%   -0.01%     
==========================================
  Files          78       78              
  Lines       28137    28131       -6     
==========================================
- Hits        22439    22433       -6     
  Misses       5698     5698              

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