TCP input stream support

[cjjacks]

Add a TCP client as an input stream option. This would add the capability to natively connect with some SDRs that serve TLM data via TCP.

The specification might look something like:

            - stream:
                name: telem_stream
                input:
                    - '1.2.3.4' # remote host
                    - 3076 # remote port
                handlers:
                    - name: ait.core.server.handlers.foo
                      packet: foo