Define a streaming protocol

[rowanG077]

Feature description
A definition of a data stream that can be used in the Core. This is the interface for using any of the network protocols.

Expected behaviour
Provide and describe datatypes for streaming data. Based on Clash Protocols

Expected steps
Implement the data types necessary. Look at the Ethernet, ICMP, IP, UDP protocols to determine common subset.

Additional Context
It's important that this is done correctly so we decided everyone will review this PR.