Suggestion: Ignore compiler warnings and information from specified directories

As a user of the vscode-java extension, I would like to ignore Java compiler warnings and information coming from certain directories.

Generated code and unit tests often generate warnings from the compiler. I would like to have warnings coming from certain directories suppressed so it'll be easier to find warnings from code we're interested in.

files.ignore is not good enough because sometimes you want to ignore warnings coming from unit tests. For example, you might want to test your equals() method against different objects, but you will get an information message telling you that it's an unlikely argument.

For now, entering src/main/** into the problems filter seems to be good enough for now, but I would like to create a workspace with some sane defaults for my coworkers to use when pulling the project.

首先检查 vscode-java 扩展中现有的问题过滤器以及 files.ignore 的行为，然后追踪编译器警告和信息是如何呈现的。完成的标准是：工作区可以指定要抑制其编译器诊断的目录，同时不会将这些文件排除在项目的其他行为之外。