Add to_string method for GeoValue (#2404)

* Add to_string method for GeoValue

* fix code style

* simplify code

Co-authored-by: dvora-h <[email protected]>

Author: AnneYang720

redis/commands/search/querystring.py

@@ -132,6 +132,9 @@ def __init__(self, lon, lat, radius, unit="km"):
         self.radius = radius
         self.unit = unit
 
+    def to_string(self):
+        return f"[{self.lon} {self.lat} {self.radius} {self.unit}]"
+
 
 class Node:
     def __init__(self, *children, **kwparams):