add support for datalinks other than ethernet

[drunkirishcoder]

Description

Add a trait Datalink that makes it possible to support a different datalink for IP packets. The only other applicable datalink supported by DPDK is InfiniBand through Mellanox NICs. #144

This is a breaking change. Previously it was assumed that IP packets (both v4 and v6) will only be encapsulated inside an Ethernet frame, which is the overwhelming majority of the use case of DPDK. After the change, the struct becomes a generic struct, Ipv4<E: Datalink>.

Type of change

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

Checklist

• Associated tests
• Associated documentation

[codecov]

Codecov Report

Merging #145 (b1e9b9d) into master (87ecc82) will increase coverage by 8.04%.
The diff coverage is 70.14%.

@@            Coverage Diff             @@
##           master     #145      +/-   ##
==========================================
+ Coverage   68.40%   76.44%   +8.04%     
==========================================
  Files          66       50      -16     
  Lines        5972     5048     -924     
==========================================
- Hits         4085     3859     -226     
+ Misses       1887     1189     -698     

Impacted Files	Coverage Δ
core/src/packets/size_of.rs	0.00% <0.00%> (ø)
core/src/testils/criterion.rs	0.00% <ø> (ø)
core/src/testils/proptest/arbitrary.rs	50.00% <ø> (ø)
core/src/runtime/mod.rs	12.32% <12.85%> (+12.32%)	⬆️
core/src/testils/packet.rs	55.55% <27.27%> (ø)
core/src/testils/proptest/strategy.rs	81.86% <39.13%> (-0.85%)	⬇️
core/src/runtime/pcap_dump.rs	39.75% <39.75%> (ø)
core/src/runtime/lcore.rs	58.00% <58.00%> (ø)
core/src/runtime/port.rs	59.46% <59.46%> (ø)
core/src/packets/icmp/v4/echo_reply.rs	70.66% <71.42%> (-1.49%)	⬇️
... and 63 more

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