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Add autosize option to OO.ui.TextInputWidget

Authored by TrevorParscal.

Description

Add autosize option to OO.ui.TextInputWidget

Works together with multiline to automatically increase the vertical size
of the textarea when needed. Uses scrollHeight technique, which has its
ups and downs but seems to work more consistently than other approaches.

Change-Id: I52b2d6e0d35f389511098321c22970a1760f0fd7