Android: on call end the memory claimed by SDK is not deallocated

[iaulakh]

Describe the bug

On call end, the application memory usage is not same as before starting call.

Application memory usage:
Before starting call - 150 mb
On start call - 240 mb
After call end - 182 mb

Tested on azure-communication-calling-1.0.0-beta.1.aar

Disposing call agent & call client to cleanup memory.

return call.hangUp(HangUpOptions()).thenRun {
            callAgent.close()
            callClient.close()
            call = null
        }

To Reproduce
Steps to reproduce the behaviour:

1. Start call
2. Attach android studio profiler
3. End call
4. Explore memory

Expected behavior
After call end, the memory claimed by application may be equal to before call.

Desktop (please complete the following information):

• OS: Mac

Smartphone (please complete the following information):

• Device: Google Pixel 4
• OS: Android 11
• Version azure-communication-calling-1.0.0-beta.1.aar

https://skype.visualstudio.com/SPOOL/_workitems/edit/2464754

[RinaRish]

AB#2464754