detect: add max_flowbits option

Also move field around to pack holes and align the struct better.

Task 8596

src/detect.h

@@ -974,11 +974,12 @@ typedef struct DetectEngineCtx_ {
     bool failure_fatal;
     uint8_t flags;       /**< only DE_QUIET */
     uint8_t mpm_matcher; /**< mpm matcher this ctx uses */
+    uint8_t max_flowbits; /**< maximum number of flowbits per signature */
+    uint32_t tenant_id;
+
     MpmConfig *mpm_cfg;
     uint8_t spm_matcher; /**< spm matcher this ctx uses */
 
-    uint32_t tenant_id;
-
     Signature *sig_list;
     uint32_t sig_cnt;