This CL opensouces a testing tool called EditTextVariations that has
been used internally to test IME behaviors on various
EditorInfo#inputType and EditorInfo#imeOptions.

Bug: 80039502
Test: Manually verified as follows.
 1. tapas EditTextVariations
 2. make -j
 3. adb install -r $ANDROID_TARGET_OUT_TESTCASES/EditTextVariations/EditTextVariations.apk
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Bug: 76692459
Test: mmma packages/inputmethods/LatinIME/
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Change-Id: I7ef3f02d52d77ad75ae1a315f4a5a48737a1da7a

This CL a logical revert of a previous CL [1], which separated Java
files into common ones and overridable ones.  Now that that overriding
concept is no longer used, there is no need to keep having separate
directory structure.

 [1]: Ic734bd4d20aa050c688a3158b1a382ae0ac18991
      fb74ab15

Fix: 79323502
Test: make -j aosp_taimen-userdebug && make -j
Test: tapas LatinIME && make -j
Change-Id: I2090bc25d18e6d4f24e91c2cbfe832755cbb4e8f

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Bug: 64712476
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Bug: 64712476
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