[image_picker] redesign example app

[syedaniq]

Replace default FloatingActionButtons with FloatingActionButton.extended to add text labels describing each button's action

fixes flutter/flutter#165888

before	after

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[flutter-dashboard]

It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

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[rekire]

JFYI you need to update the change log. There is a failing test complaining about that.

[syedaniq]

@rekire Thank you for looking into the failing test. I've updated the changelog but was not sure wether a version bump is necessary. Could you please confirm?

[stuartmorgan-g]

test-exempt: this is a Flutter-team-facing test app, so doesn't need testing of UI

[stuartmorgan-g]

CHANGELOG/version override: Although this file is published to pub.dev, the change here isn't relevant to package clients, only to local package developers, so it doesn't matter if/when it is published.