Use inspector class -- remove global Semaphore and improve error handling

cli.py

@@ -1,8 +1,6 @@
 import asyncio
-import logging
 import os
 import signal
-import sys
 from functools import wraps
 
 import click
@@ -11,9 +9,6 @@ from mev_inspect.inspector import MEVInspector
 
 RPC_URL_ENV = "RPC_URL"
 
-logging.basicConfig(stream=sys.stdout, level=logging.INFO)
-logger = logging.getLogger(__name__)
-
 
 @click.group()
 def cli():
@@ -49,6 +44,16 @@ async def inspect_block_command(block_number: int, rpc: str, cache: bool):
     await inspector.inspect_single_block(block=block_number)
 
 
+@cli.command()
+@click.argument("block_number", type=int)
+@click.option("--rpc", default=lambda: os.environ.get(RPC_URL_ENV, ""))
+@coro
+async def fetch_block_command(block_number: int, rpc: str):
+    inspector = MEVInspector(rpc=rpc)
+    block = await inspector.create_from_block(block_number=block_number)
+    print(block.json())
+
+
 @cli.command()
 @click.argument("after_block", type=int)
 @click.argument("before_block", type=int)