Relax app dependencies for `lightning` | breaking imports from `L` (#18386)
* make App conditional import
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* ci: min req.
* data + store
* typo
* module_available
* extra
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* typo
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* envs
* doctest
* more
* docs
* **
* rm
* -f
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* docs
* Revert "docs"
This reverts commit 20e8e6be98.
* Apply suggestions from code review
* warnings
* breaking
* ...
* fixing source
* fixing examples
* fixing tests
* fixing docs
* fixing source
* fix mock
* fix trainer
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