Custom kotlin code

[bl1nch]

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Describe the requested feature

Hi @FeodorFitsner, what do you think about allowing users to implement custom Kotlin code in an app buit with flet?
For example flet could replace the kotlin dir in the build-template with a Cookiecutter from the project's kotlin dir where users could put their own MainActivity.kt and other .kt files and do some stuff inside by using MethodChannel. So it would also need invoke_custom_method in the Page python class and some modifications inside packages/flet/lib/src/reducers.dart

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[bl1nch]

Maybe it's worth just implementing this for now, allowing users to call platform methods using a custom build template?
main...bl1nch:flet:dev