Improve protocol tracing for collocated calls

[pepone]

In 3.8 we include tracing for the transport along with requests, for collocated calls we could include "collocated = true" to make clear that the transport info is not present because the requests is a collocated request.

See for example this tracing:

-- 12/12/24 18:11:30385 ./writer: Protocol: sending request 
   message type = 0 (request)
   compression status = 0 (not compressed; do not compress response, if any)
   message size = 159
   request id = 1
   identity = forwarders/2
   facet = 
   operation = announceTopicWriter
   mode = 2 (idempotent)
   context = 
   encoding = 1.1
....
-- 12/12/24 18:11:30386 ./writer: Protocol: sending request 
   message type = 0 (request)
   compression status = 0 (not compressed; do not compress response, if any)
   message size = 163
   request id = 0 (oneway)
   identity = DataStorm/Lookup
   facet = 
   operation = announceTopicWriter
   mode = 2 (idempotent)
   context = 
   encoding = 1.1
   transport = udp
   local address = 192.168.86.184:59947
   remote address = 239.255.0.1:10000

The initial announceTopicWriter send to forwarders/2 is a collocated requests, that is why it doesn't include any transport info. Adding collocated = true would make clear it is a collocated request.