Add getStrategy and setWatermark method cuz it is required by logic

src/CreatorCoin.php

@@ -107,6 +107,11 @@ public function setIsCreator(bool $is_creator): static  {
     return $this;
   }
 
+  public function setWatermark(int $watermark): static {
+    $this->watermark = max($this->supply, $watermark);
+    return $this;
+  }
+
   // https://github.com/bitclout/core/blob/d268ff4d11f98b65a0438d84b3e9a5397eaef84e/lib/block_view.go#L2039
   /**
    * Emulate buy creator coins of account
@@ -267,6 +272,10 @@ public function getLastSell(): array {
     return $this->sell;
   }
 
+  public function getStrategy(): string {
+    return $this->strategy;
+  }
+
   // This method is required to call with additional parameter
   // To follow code logic of salamon bug fixing
   public function adjustSellAmount(int $amount, int $held): int {