fix: Rename inner product distance search function to inner_product (#168)

Author: duwenxin99

src/langchain_google_cloud_sql_pg/indexes.py

@@ -30,7 +30,7 @@ class DistanceStrategy(StrategyMixin, enum.Enum):
 
  EUCLIDEAN = "<->", "l2_distance", "vector_l2_ops"
  COSINE_DISTANCE = "<=>", "cosine_distance", "vector_cosine_ops"
- INNER_PRODUCT = "<#>", "ip_distance", "vector_ip_ops"
+ INNER_PRODUCT = "<#>", "inner_product", "vector_ip_ops"
 
 
 DEFAULT_DISTANCE_STRATEGY = DistanceStrategy.COSINE_DISTANCE