Missing methods getStdout and getStderr in TestCase

Test cases include two extra fields in test report output: stdout and stderr.
However the com.offbytwo.jenkins.model.TestCase class does not include them.

I can prepare a pull request that adds them - is that a good idea?

从 com.offbytwo.jenkins.model.TestCase 开始，将其可用属性与测试报告输出中存在的 stdout 和 stderr 字段进行比较。确认预期的访问器，并检查现有的 TestCase 相关测试；当可以通过模型一致地访问这两个字段时即表示完成。

由索引模型根据 Issue 内容生成。