When receiving, enable Bluetooth automatically if not enabled already

[bzzrak]

When I want to receive a file, I need to turn BT on in advance. It would be nice if the app did this by itself

[ShortDevelopment]

Similar to the code in SendActivity

android/src/SendActivity.cs

Lines 209 to 214 in 92ef4de

	if (remoteSystem.Endpoint.TransportType == CdpTransportType.Rfcomm &&
	_cdp.TryGetTransport<BluetoothTransport>()?.Handler.IsEnabled == false)
	{
	StartActivityForResult(new Intent(BluetoothAdapter.ActionRequestEnable), 42);
	throw new TaskCanceledException("Bluetooth is disabled");
	}

a check should be implemented in the ReceiveActivity

android/src/ReceiveActivity.cs

Line 166 in 92ef4de

void InitializeCDP()

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Ideally, the app would wait for the result and continue instead of showing an error