Added the underlying pageController to the TransformInfo.

[Scopewriter]

Hi, I have added the underlying pageController to the TransformInfo, as more fine grained control is sometimes needed in transformers. In my specific use case, I'm also doing animations elsewhere on the screen based on the swipe event and therefore needs the from- and to index, direction etc. in the same event.

[coveralls]

Pull Request Test Coverage Report for Build 34

• 0 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 48.097%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/transformer_page_view.dart	0	2	0.0%
<!--	Total:	0	2

Files with Coverage Reduction	New Missed Lines	%
lib/transformer_page_view.dart	2	56.52%
<!--	Total:	2

Totals
Change from base Build 30:	-0.2%
Covered Lines:	139
Relevant Lines:	289

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💛 - Coveralls

[shivam-7500]

Scopewriter can u plz explain how u added a pagecontroller property to the TransformerPageView.builder. In my specific use case, I also need an explicit controller for controlling the state of the app bar