Reintroduce InputMethodInfo constructor for CTS

This reintroduces an InputMethodInfo constructor that is required for
CTS. In [1] it was modified to include an additonal String, but the
original signature is still required.

  [1]: I18e7c5dc5271bee44e4540b3070b989df4e27c4c

Bug: 325708986
Test: atest InputMethodInfoTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:2fdc875f2df390f2fbdec5847de64caded33f62c)
Merged-In: Iaa5a365f20146f9a3b640a10d3b3f357de322521
Change-Id: Iaa5a365f20146f9a3b640a10d3b3f357de322521