FCS-part of Ethernet header

[indraniBh]

Fixes #379

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New Inclusions:
flows/packet/ethernet/fcs

Objective:
Support FCS in ethernet header to generate good as well as bad packet using raw traffic.

Code Snippet:

cfg := gosnappi.NewConfig()

// skipping other config snippets

flow := cfg.Flows().Add()
flow.SetName("f1").TxRx().Port().SetTxName("p1").SetRxName("p2")
pkt:= flow.Packet()
// setting valid fcs, by default fcs is set good. 
pkt.Add().Ethernet().Fcs().Generated().Good()
// setting invalid fcs
pkt.Add().Ethernet().Fcs().Generated().Bad()

Feature Support Info:

ixia-hw	ixia-c	UHD
✓	✗	✗