Fix zuiFind crash / RM_ScanKey hang on SET object listpack encoding (#11581)

In #11290, we added listpack encoding for SET object.
But forgot to support it in zuiFind, causes ZINTER, ZINTERSTORE,
ZINTERCARD, ZIDFF, ZDIFFSTORE to crash.
And forgot to support it in RM_ScanKey, causes it hang.

This PR add support SET listpack in zuiFind, and in RM_ScanKey.
And add tests for related commands to cover this case.

Other changes:
- There is no reason for zuiFind to go into the internals of the SET.
  It can simply use setTypeIsMember and don't care about encoding.
- Remove the `#include "intset.h"` from server.h reduce the chance of
  accidental intset API use.
- Move setTypeAddAux, setTypeRemoveAux and setTypeIsMemberAux
  interfaces to the header.
- In scanGenericCommand, use setTypeInitIterator and setTypeNext
  to handle OBJ_SET scan.
- In RM_ScanKey, improve hash scan mode, use lpGetValue like zset,
  they can share code and better performance.

The zuiFind part fixes #11578

Co-authored-by: Oran Agra <oran@redislabs.com>
Co-authored-by: Viktor Söderqvist <viktor.soderqvist@est.tech>

1 files changed, 1 insertions, 6 deletions

diff --git a/src/t_set.c b/src/t_set.c
index ae5f26540..557ba35ce 100644
--- a/src/t_set.c
+++ b/src/t_set.c
@@ -28,12 +28,7 @@
  */
 
 #include "server.h"
-
-/* Internal prototypes */
-
-int setTypeAddAux(robj *set, char *str, size_t len, int64_t llval, int str_is_sds);
-int setTypeRemoveAux(robj *set, char *str, size_t len, int64_t llval, int str_is_sds);
-int setTypeIsMemberAux(robj *set, char *str, size_t len, int64_t llval, int str_is_sds);
+#include "intset.h"  /* Compact integer set structure */
 
 /*-----------------------------------------------------------------------------
  * Set Commands