Start outputting tags

So far the Java analyzer only provides automated feedback on submitted solutions, but analyzers can also tag them.

There are multiple approaches to implement this:

• We can start outputting tags in the exercise-specific analyzers, and exercises for which no analyzer is implemented yet will receive no tags on their submissions.
• We can implement a 'global' analyzer that is able to identify paradigms, techniques, constructs etc regardless of which exercise a solution belongs to, so that all submissions will receive tags.
• We can combine both options of course.

I found that the C# Analyzer took the second option. This makes sense, since a large portion of the tags currently implemented are exercise-agnostic. Perhaps it can serve as a good example to get started.

首先阅读 issue 中链接的 analyzer 标记文档，然后将提议的方法与 src/Exercism.Analyzers.CSharp/Analyzers/TagAnalyzer.cs 中的 C# 示例进行比较。该 issue 没有确定 Java 的入口点、测试或已确定的实现计划；只有在达成统一的标记方法并为 Java 提交生成 tags 后，才能算完成。