[flutter_plugin_android_lifecycle] Update Android example to use Kotlin DSL syntax

[AbdeMohlbi]

edits the android example to follow the suggestions to convert the code to kotlin in docs

• add-equals
• convert-lists

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[AbdeMohlbi]

hi @reidbaker i do not think requires a version bump/edits to changelog WDYT ?

[reidbaker]

Please also link flutter/flutter#176065 since some of this work is for kotlin conversion.

Finally consider adding a check + test in https://github.com/flutter/packages/blob/main/script/tool/lib/src/gradle_check_command.dart for changes we want to enforce across the repo.

[reidbaker]

These lines do not need a version bump.

[reidbaker]

We need to show our work on why this deletion is safe. I think the best way to show that publicly would be to file an issue that says to delete these lines. Then also shows your work for why this is safe to delete preferably with links to prs that took this code from required to not required. Then in this pr link that bug as related.