refactor: improve gossip broker cleanup and enhance CLI wallet transaction handling

- Refactor _InProcessBroadcast.subscribe to use asynccontextmanager for cleaner resource cleanup
- Remove manual release callback in _InProcessSubscriber
- Update file-based wallet send to submit transactions via blockchain RPC
- Fetch balance and nonce from chain before sending transactions
- Add tx_hash and status tracking to local transaction history
- Enhance run_subprocess to support additional kwargs and return Comp

fix_inprocess.py

@@ -0,0 +1,30 @@
+import asyncio
+from contextlib import asynccontextmanager
+from typing import Any
+
+class _InProcessSubscriber:
+    def __init__(self, queue, release):
+        self._queue = queue
+        self._release = release
+    def __aiter__(self):
+        return self._iterator()
+    async def _iterator(self):
+        try:
+            while True:
+                yield await self._queue.get()
+        finally:
+            pass
+
+@asynccontextmanager
+async def subscribe():
+    queue = asyncio.Queue()
+    try:
+        yield _InProcessSubscriber(queue, lambda: None)
+    finally:
+        pass
+
+async def main():
+    async with subscribe() as sub:
+        print("Success")
+
+asyncio.run(main())