* [tools]build ipa validate launch image using template files

* reuse more code by sharing the same file key

* fix space

* [tools]build ipa validate template icon files

* use the same box for both validations, and added some unit test, and some nits

* add unit test for templateImageDirectory

* use fs.path.join intead of raw path

* use the correct filesystem

* lint

* use absolute path for flutter_template_images

* fix rebase

* update indentation

This reverts commit e6300da2.

* Add a new PrebuiltFlutterApplicationPackage interface.

* Review feedback

* Rename bundleDir to uncompressedBundle

* Switch to use xml in PlistParser

* Review feedbacks: Change dynamic to Object, remove getValueFromFile