Merge existing tcp and udp sources into a single socket source

We’ve simplified our socket based sources into a single socket source

The tcp and udp sources no longer exist and have been merged into a new socket type.

Upgrade Guide

Migration is straight forward, simply change the type to socket and add the field mode to match the socket type (tcp or udp):

 [sources.my_tcp_source]
-  type = "tcp"
+  type = "socket"
   address = "0.0.0.0:9000"
+  mode = "tcp"