[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.

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

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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.

[vashworth]

LGTM!

[stuartmorgan-g]

LGTM