feat: initialize project structure with build configuration and core …

[Badley08]

Summary of Changes

• Fix unwanted keyboard appearance on non-editable targets:
  • Updated onShowInputRequested and onEvaluateInputViewShown in LatinIME.java to verify InputType.TYPE_NULL and avoid displaying the soft keyboard when focus is on

[Badley08]

Fix unwanted keyboard popup on non-editable fields and resolve string boundary check

• Prevent soft keyboard from appearing when input target is null or TYPE_NULL.
• Fix off-by-one boundary traversal in StringUtils.charIndexOfFirstWhitespace.
• Clean up unused constants and update version naming to 2.5.8.