MINOR: quic: QUIC transport parameters split.

Make the transport parameters be standlone as much as possible as
it consists only in encoding/decoding data into/from buffers.
Reduce the size of xprt_quic.h. Unfortunalety, I think we will
have to continue to include <xprt_quic-t.h> to use the trace API
into this module.
diff --git a/Makefile b/Makefile
index fb57ef8..59b383c 100644
--- a/Makefile
+++ b/Makefile
@@ -637,7 +637,7 @@
                 src/quic_frame.o src/quic_cc.o src/quic_cc_newreno.o src/mux_quic.o \
                 src/cbuf.o src/qpack-dec.o src/qpack-tbl.o src/h3.o src/qpack-enc.o \
                 src/hq_interop.o src/cfgparse-quic.o src/quic_loss.o \
-                src/quic_stream.o src/quic_stats.o
+                src/quic_tp.o src/quic_stream.o src/quic_stats.o
 endif
 
 ifneq ($(USE_LUA),)