Add javalib examples on using jlink, jpackage, and producing JPMS modules (500USD Bounty)

[lihaoyi]

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From the maintainer Li Haoyi: I'm putting a 500USD bounty on this issue, payable by bank transfer on a merged PR implementing this.

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These are newer Java tools that we should have documented/tested golden paths to using. The examples should go in example/javalib/module with /** Usage */ tests and textual explanations of what the examples are doing and how they relate to the underlying tools and concepts (with links to the relevant upstream documentation pages)

[lefou]

• [WIP] Experiment with jpackage to create executable binaries #3201