Remove data from filesystems when plugins are uninstalled

[JoshuaBehrens]

1. Why is this change necessary?

@mitelg once said

#206 (comment)

Are there already cleanup tasks that delete plugin directories on life cycle?

not yet 😊

So we should clean files up like assets and migrations, right?

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[keulinho]

Hey @JoshuaBehrens,

thanks for the PR!
We were just wondering if this may lead to surprising cases, because this now deletes stuff "magically". What do you think about making this more explicit by requiring the plugins to opt-in to this behaviour, e.g. by a clearFilesystemOnInstall() method on the base class?

Also the case for the handling with the additional bundles is pretty similiar then your other PR where you fixed it for the assets, maybe it makes sense to combine the two approaches somehow, as they are also conceptually quite similiar

[tinect]

I think, the user should also decide whether the filesystems should be deleted. E.g. related private filesystem may contain important files for business.