feat(playerbots): staggered taxi take-off for bots (#1281)

* feat(playerbots): staggered taxi take-off for bots

Adds four new configurable settings to playerbots.conf:

- AiPlayerbot.BotTaxiDelayMinMs:   Min random delay before the 1st follower bot clicks the flight-master
- AiPlayerbot.BotTaxiDelayMaxMs:   Upper bound for the overall taxi delay window – larger spreads big raids
- AiPlayerbot.BotTaxiGapMs:        Fixed gap added per group-slot so bots never take off together
- AiPlayerbot.BotTaxiGapJitterMs:  Extra small randomness added to each gap so launches don’t look robotic

These options allow server owners to fine-tune how bots queue up and take off from flight masters, making their behavior appear more natural.

Closes #1017 : Bots use Flight master nearly the same time.

* fixed build errors

Was missing a header and variable declarations.

src/PlayerbotAIConfig.h

@@ -348,6 +348,12 @@ public:
     uint32 useFlyMountAtMinLevel;
     uint32 useFastFlyMountAtMinLevel;
 
+    // stagger flightpath takeoff
+    uint32 delayMin;
+    uint32 delayMax;
+    uint32 gapMs;
+    uint32 gapJitterMs;
+
     std::string const GetTimestampStr();
     bool hasLog(std::string const fileName)
     {