Move tracking of in_streaming to PGOutputData

"in_streaming" is a flag used to track if an instance of pgoutput is
streaming changes.  When pgoutput is started, the flag was always reset,
switched it back and forth in the stream start/stop callbacks.

Before this commit, it was a global variable, which is confusing as it
is actually attached to a state of PGOutputData.  Per my analysis, using
a global variable did not lead to an active bug like in 54ccfd6586,
but it makes the code more consistent.  Note that we cannot backpatch
this change anyway as it requires the addition of a new field to
PGOutputData, exposed in pgoutput.h.

Author: Hou Zhijie
Reviewed-by: Amit Kapila, Michael Paquier, Peter Smith
Discussion: https://postgr.es/m/OS0PR01MB571690EF24F51F51EFFCBB0E94FAA@OS0PR01MB5716.jpnprd01.prod.outlook.com

src/include/replication/pgoutput.h

@@ -21,6 +21,9 @@ typedef struct PGOutputData
 								 * allocations */
 	MemoryContext cachectx;		/* private memory context for cache data */
 
+	bool		in_streaming;	/* true if we are streaming a chunk of
+								 * transaction */
+
 	/* client-supplied info: */
 	uint32		protocol_version;
 	List	   *publication_names;