feat: generate java configs

[tisonkun]

See the changeset.

[tisonkun]

just's result is not the final result. I manually run ./mvnw spotless:apply and format the file with Intellij IDEA to populate <p>.

This is a bit awkward but I suppose the config class is relatively stable. Perhaps after Java support docs in markdown and our library reach that minimum version (a couple of years later? 🤣 ), things would change.

UPDATE: Or instead, find a way to convert rustdoc in markdown to javadoc.

[Xuanwo]

This is a bit awkward but I suppose the config class is relatively stable.

This is fine as a starting point. However, in the near future, we will run just generate in CI to ensure there are no external changes to those files. Is the Javadoc requirement optional? Will it work if we only run just generate java && ./mvnw spotless:apply?

[tisonkun]

Not exactly. But I can help in make a reasonable stable version at that time.

[Xuanwo]

Thank you @tisonkun for this. I have wanted it for so long, and it has finally come true.