[diag] add prefix tlv definition and parsing into diagnostic data #311
+296
−9
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The Prefix TLV is a TLV included in Network data. This TLV records information about all border routers in the network and route information to external networks. It is helpful for users to understand the routing status between the Thread network and external networks.
Prefix TLV has three types of sub-tlv:
Test: unit test