Currently query_options objects is passed to a trace stopping function
which makes it mandatory to make them alive until the end of the
query. The reason for that is to add prepared statement parameters to
the trace. All other query options that we want to put in the trace are
copied into trace_state::params_values, so lets copy prepared statement
parameters there too. Trace enabled case will become a little bit more
expensive but on the other hand we can drop a continuation that holds
query_options object alive from a fast path. It is safe to drop the call
to stop_foreground_prepared() here since The tracing will be stopped
in process_request_one().
Message-Id: <20191205102026.GJ9084@scylladb.com>
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