Add Navigation3 snippets to main

[dturner]

Add Navigation3 snippets to main (only merge when Nav3 is stable)

[snippet-bot]

Here is the summary of changes.

You are about to add 12 region tags.

• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/animations/AnimationSnippets.kt:44, tag android_compose_navigation3_animations_1
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/basic/BasicSnippets.kt:31, tag android_compose_navigation3_basic_1
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/basic/BasicSnippets.kt:58, tag android_compose_navigation3_basic_2
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/basic/BasicSnippets.kt:81, tag android_compose_navigation3_basic_3
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/basic/BasicSnippets.kt:92, tag android_compose_navigation3_basic_4
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/savingstate/SavingStateSnippets.kt:28, tag android_compose_navigation3_savingstate_1
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/savingstate/SavingStateSnippets.kt:43, tag android_compose_navigation3_savingstate_2
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/scenes/ScenesSnippets.kt:42, tag android_compose_navigation3_scenes_1
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/scenes/ScenesSnippets.kt:51, tag android_compose_navigation3_scenes_2
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/scenes/ScenesSnippets.kt:75, tag android_compose_navigation3_scenes_3
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/scenes/ScenesSnippets.kt:161, tag android_compose_navigation3_scenes_4
• compose/snippets/src/main/java/com/example/compose/snippets/navigation3/scenes/material/MaterialScenesSnippets.kt:44, tag android_compose_navigation3_scenes_material_1

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