Added trimmed key space notification (#345)

Author: Meir Shpilraien (Spielrein)

src/include/redismodule.h

@@ -227,6 +227,8 @@ This flag should not be used directly by the module.
 #define REDISMODULE_NOTIFY_LOADED (1<<12)     /* module only key space notification, indicate a key loaded from rdb */
 #define REDISMODULE_NOTIFY_MODULE (1<<13)     /* d, module key space notification */
 #define REDISMODULE_NOTIFY_NEW (1<<14)        /* n, new key notification */
+/* RL Extension: */
+#define REDISMODULE_NOTIFY_TRIMMED (1<<30)     /* trimmed by reshard trimming */
 
 /* Next notification flag, must be updated when adding new flags above!
 This flag should not be used directly by the module.

src/raw.rs

@@ -125,6 +125,7 @@ bitflags! {
         const LOADED = REDISMODULE_NOTIFY_LOADED;
         const MISSED = REDISMODULE_NOTIFY_KEY_MISS;
         const ALL = REDISMODULE_NOTIFY_ALL;
+        const TRIMMED = REDISMODULE_NOTIFY_TRIMMED;
     }
 }