Fix preloaded pool size (#19)

* chore: rename blocks_preload_pool_size to preload_pool_size for consistency

* chore: rename preload_pool_size to blocks_preload_pool_size for consistency

* deprecate preload_pool_size and introduce block_preload_pool_size with warning

* fix: set default value for preload_pool_size in LakeConfig

* chore: warn user only if he provided `preload_pool_size` attribute

---------

Co-authored-by: Ivan Frolov <frolvanya@gmail.com>

src/near_lake_framework/__init__.py

@@ -48,24 +48,31 @@ class LakeConfig:
     aws_access_key_id: str
     aws_secret_key: str
     start_block_height: near_primitives.BlockHeight
-    blocks_preload_pool_size: int = 200
+    blocks_preload_pool_size: int
 
     def __init__(  # pylint: disable=too-many-arguments
         self,
         network: Network,
         aws_access_key_id: str,
         aws_secret_key: str,
         start_block_height: near_primitives.BlockHeight,
-        preload_pool_size: int = 200,
+        preload_pool_size: None = None,
+        block_preload_pool_size: int = 200,
     ):
+        if preload_pool_size:
+            logger.warning(
+                "The 'preload_pool_size' argument is not used and will be deprecated in a "
+                "future release. Use 'blocks_preload_pool_size' instead."
+            )
+
         # These are entirely determined by Network.
         self.s3_bucket_name = f"near-lake-data-{network.value}"
         self.s3_region_name = "eu-central-1"
 
         self.aws_access_key_id = aws_access_key_id
         self.aws_secret_key = aws_secret_key
         self.start_block_height = start_block_height
-        self.preload_pool_size = preload_pool_size
+        self.blocks_preload_pool_size = block_preload_pool_size
 
 
 async def start(config: LakeConfig, streamer_messages_queue: asyncio.Queue):