RFR: 7903300: Add test library support to jtreg plugin

[Guoxiong Li]

On Thu, 15 Sep 2022 13:38:55 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> Note that there is a workaround for the problem mentioned in this PR (not that I think it wouldn't be nice to fix). The IDE will typically suggest to add relevant test libraries when clicking on the light-bulb fix icon beside a TestNG/JUnit import.

Yes, I fixed the problem locally by using this way. But I think it is good to let the plugin fix it automatically, so I write this patch.

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PR: https://git.openjdk.org/jtreg/pull/117