Remove equality methods in KV Cache events data classes

Equality methods are unnecessary as its provided by the parent class
'msgspec.Struct' which they extend from.

Review comment:
https://github.com/vllm-project/vllm/pull/28309/files#r2539044714

Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

Author: hickeyma

vllm/distributed/kv_events.py

@@ -54,30 +54,11 @@ class BlockStored(KVCacheEvent):
     lora_id: int | None
     medium: str | None
 
-    def __eq__(self, other):
-        if isinstance(other, BlockStored):
-            return (
-                self.block_hashes == other.block_hashes
-                and self.parent_block_hash == other.parent_block_hash
-                and self.token_ids == other.token_ids
-                and self.block_size == other.block_size
-                and self.lora_id == other.lora_id
-                and self.medium == other.medium
-            )
-        return False
-
 
 class BlockRemoved(KVCacheEvent):
     block_hashes: list[ExternalBlockHash]
     medium: str | None
 
-    def __eq__(self, other):
-        if isinstance(other, BlockRemoved):
-            return (
-                self.block_hashes == other.block_hashes and self.medium == other.medium
-            )
-        return False
-
 
 class AllBlocksCleared(KVCacheEvent):
     pass