java.completion.importOrder (even the default) takes precedence over checkstyle specs

The java.completion.importOrder property, documented here
https://github.com/redhat-developer/vscode-java/blob/562afa80c0f705613c6ed3148b4d9eac82093b26/package.json#L519-L527
does not play well with checkstyle. If checkstyle specifies a different sort order for imports, the default importOrder setting will always be used instead. An unsatisfactory workaround is to attempt to specify a matching importOrder via this property. However, it's simply not as expressive as what is possible via Checkstyle, so finding an exact match is impossible.

This situation creates the highly likely event of imports being automatically sorted via the editor, and then the resulting code is in violation of checkstyle constraints, so a CI or regular build process will fail.

Here's an example of just such a sad situation: https://github.com/DSpace/DSpace/pull/8088/commits/23e93ff2857b7099ba8005d0b5b6c3b65f052f1c

Environment

• Operating System: OSX
• JDK version: openjdk version "11.0.2" 2019-01-15
• Visual Studio Code version: 1.63.2
• Java extension version: v1.3.0

Steps To Reproduce

1. work on a Java project with a checkstyle configuration (one example: DSpace/DSspace)
2. install a checkstyle plugin
3. configure the checkstyle plugin to use the project configuration
4. open a Java file
5. click the yellow light bulb that appears over the Java file's imports, select 'organize imports'
6. save the file
7. validate the project against the custom checkstyle, it will fail, if the checkstyle specification for import order differs from the default value of the java.completion.importOrder property

Current Result

imports are always sorted to match the order specified by java.completion.importOrder

Expected Result

imports are sorted to match the order specified by checkstyle

Additional Informations

从 package.json 第 519-527 行的 java.completion.importOrder 文档开始，使用带有自定义 Checkstyle 配置的项目复现 organize-imports 的步骤。将生成的 imports 与 Checkstyle 指定的顺序进行比较。当 Checkstyle 指定了不同顺序时，organize-imports 不再无条件应用默认顺序，即视为完成。