Incomplete IPv6 support (e.g. jumbograms)

[fako1024]

In fako1024/slimcap#55 it was shown that slimcap supports IPv6 jumbograms already. However, since the transport layer is stored in a different location than usually expected in our current IPv6 parsing protocol specific parsing currently doesn't work (e.g. extraction of TCP / UDP ports).

This is not limited to jumbograms - any extension header will be ignored at present.

DoD

• Add samples to E2E tests (obtained in linked issue + additional ones)
• Add synthetic test to capture package
• Adjust IPv6 parsing to support extraction of extension headers / transport layer information