Formatting support

Not easy to use or set up/Don't know how to configure or customize formatting option
The formatter settings don't take any effect/The formatter result is not as expected
Indentation problems: indentation should be overridden with formatter profile
Feature requests: support IntelliJ scheme, support google-java-format, support integrating checkstyle etc.

Introduce VS Code style formatter scheme
- Introduce new VS Code configuration: java.format.settings
  - Deprecate existing java.format.settings.url and java.format.settings.profile
  - Accepts different formatter schemes (engines)
  - Keep compatibility with current custom profile path
  - Can configure some popular formatter rules
    - A subset of eclipse formatter settings, consist of The settings mentioned in existing Github issues
  - Relationship with VS Code indentation settings: Override?
- Migrate "VS Code formatter settings preview" to vscode-java
  - The description of the configuration java.format.settings should contain a markdown command to the preview UI
Other features should respect correct formatter options (especially indentation & tab/space)
- Code Action/refactoring/quickfix
- Paste handler

New capabilities
- Transformed from IntelliJ formatter settings https://github.com/redhat-developer/vscode-java/issues/998
- Cooperate/integration with "Clean-up"
  - Some features in formatter from IntelliJ side can be found in "Clean-up" from eclipse side, e.g., add braces in if statement: https://github.com/redhat-developer/vscode-java/issues/2846
- Quick fixes for detected formatting problems
AST sync issue
- https://github.com/redhat-developer/vscode-java/issues/1132
- https://github.com/redhat-developer/vscode-java/issues/2107

説明