remove unused task in CoreBluetooth backend

The _central_manager_delegate_ready task doesn't appear to do anything
useful (not used by anything) and it may never finish which can cause
an error when an application exits.

Task was destroyed but it is pending!
task: <Task pending name='Task-2' coro=<Application._central_manager_delegate_ready() running at bleak/backends/corebluetooth/__init__.py:46>>

bleak/backends/corebluetooth/CentralManagerDelegate.py

@@ -85,13 +85,6 @@ def enabled(self):
     def isConnected(self) -> bool:
         return self._connection_state == CMDConnectionState.CONNECTED
 
-    async def is_ready(self):
-        """is_ready allows an asynchronous way to wait and ensure the
-        CentralManager has processed it's inputs before moving on"""
-        while not self.ready:
-            await asyncio.sleep(0)
-        return self.ready
-
     async def scanForPeripherals_(self, scan_options) -> List[CBPeripheral]:
         """
         Scan for peripheral devices

bleak/backends/corebluetooth/__init__.py

@@ -26,7 +26,6 @@ class Application:
     def __init__(self):
         self.main_loop = asyncio.get_event_loop()
         self.main_loop.create_task(self._handle_nsrunloop())
-        self.main_loop.create_task(self._central_manager_delegate_ready())
 
         self.nsrunloop = NSRunLoop.currentRunLoop()
 
@@ -43,9 +42,6 @@ async def _handle_nsrunloop(self):
             self.nsrunloop.runMode_beforeDate_(NSDefaultRunLoopMode, time_interval)
             await asyncio.sleep(0)
 
-    async def _central_manager_delegate_ready(self):
-        await self.central_manager_delegate.is_ready()
-
 
 # Restructure this later: Global isn't the prettiest way of doing this...
 global CBAPP