Icon button snippets

[wardlauren]

Adding icon button snippets.

Updating toml file to add dependency for extended icons.

[JolandaVerhoef]

@riggaroo can you inform us whether the material extended icons are still okay to use or if we should use hard-coded drawables instead?

[riggaroo]

We should be using hardcoded drawables created through Android Studio tooling - material-icons-extended is not the up-to-date set of icons that we should be recommending to developers to use.

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• compose/snippets/src/main/java/com/example/compose/snippets/components/IconButton.kt:43, tag android_compose_components_togglebuttonexample
• compose/snippets/src/main/java/com/example/compose/snippets/components/IconButton.kt:61, tag android_compose_components_iconbutton
• compose/snippets/src/main/java/com/example/compose/snippets/components/IconButton.kt:95, tag android_compose_components_momentaryiconbuttons

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