Add ConnectionService to enhance calling experience.

[hokyungh]

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Tell us about your request

What do you want us to build?

Add ConnectionService to integrate with built-in phone app. iOS already has this feature

Which Amazon Chime SDK or feature area is this request for?
Such as: amazon-chime-sdk-js, amazon-chime-sdk-ios, amazon-chime-sdk-android, amazon-chime-sdk-component-library-react, a new feature idea.

amazon-chime-sdk-android

Tell us about the problem you are trying to solve and why is it hard?

The more details you provide us, the better we will be able to help you.
There is not much guide on implementing ConnectionService with Amazon Chime SDK.

How are you currently solving a problem?

N/A

Are there any workarounds or mitigations you have used? Why is it not working for you?
N/A

Additional context

Anything else we should know?