add in predictive back snippets for NavHost and predictive back handler

[trambui09]

Add in the predictive back snippets for NavHost implementation and the Predictive Back Handler for a navigation drawer

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• compose/snippets/src/main/java/com/example/compose/snippets/predictiveback/PredictiveBackSnippets.kt:35, tag android_compose_predictiveback_navhost
• compose/snippets/src/main/java/com/example/compose/snippets/predictiveback/PredictiveBackSnippets.kt:115, tag android_compose_predictivebackhandler

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[riggaroo]

You can make these private and possible name it PredictiveBackOverrideExit?

[trambui09]

Yeah!

[trambui09]

Closing PR as this is a dup of a merged PR.