Add Telecom Jetpack library snippets

[natarajkr007]

• Add snippets for VoIP call log exclusion
• Add snippets for handling VoIP callback intents
• Add snippets for dialer callback initiation
• Add sample dialer and VoIP app modules for Telecom
• Add core-telecom dependency and necessary permissions configuration

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• telecom/voipapp/src/main/AndroidManifest.xml:19, tag android_telecom_own_calls_permission_entry
• telecom/voipapp/src/main/AndroidManifest.xml:32, tag android_telecom_activity_callback_handle_entry

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[gemini-code-assist]

Code Review

This pull request introduces two new modules, :telecom:dialer and :telecom:voipapp, to demonstrate Jetpack Telecom features such as VoIP call log integration and callback handling. The review feedback identifies critical syntax errors in the Gradle configuration for compileSdk across both modules and the use of a non-standard API constant in a @RequiresApi annotation. Additionally, the reviewer pointed out several instances of unused variables and methods, as well as a logical inconsistency regarding the return type of a helper function in the VoIP application.

[kkuan2011]

The spotless check seems to be failing too, I'm not sure if this is because the change is coming from a forked version of the repo. I also saw it for the failed spotless check on this PR: #866