[iOS] Detect some memory leaks from AzureCommunicationCallingSDK

[AmyL219]

Describe the bug Just do a leaking test on our App using Instruments. Found there are some leaks detected from AzureCommunicationCallingSDK when remote participants join the meeting/left the group meeting

To Reproduce Steps to reproduce the behavior:

1. Join a group call
2. Join several remote participants with camera on, and this would produce memory leaks
3. Turn on/off remote participants' camera, would also produce memory leaks
4. When remote participant leave, I could see the memory increase when one remote participant leave, but eventually when all remote participant leave and there is only local user, it down the memory persistency around 135 mb. Small memory leak would be detected.

Expected behavior No memory leak

Screenshots

Smartphone (please complete the following information):

• Device: simulator 11
• OS: 14.5
• Version '1.0.1'