Tracking issue of the first release of OpenDAL Java binding

[tisonkun]

• Improve Javadoc for all classes
• Integrate Javadoc generation with official site CI workflow
• Ensure the release process works

[tisonkun]

@Xuanwo You may take a look at whether other stuff is missing here before we make a formal 0.1.0 release.

For 1 and 2, they should be trivial with mvn javadoc:javadoc and copy the generated content to the site folder, like other bindings do.

For 3, I'll investigate a bit if we can add an automation in ci-opendal repo now. The whole process should be associated with Nexus staging and close staging also.

[Xuanwo]

Mostly LGTM. I have some ideas now, but I don't think they are significant enough to block opendal-java 0.1.

• Does java have something like Reader/Writer? If so, it's better for us to implement them so that users can use our Reader like native File struct.
• We can export append support for java which is needed by @ShadowySpirits
• Additionally, maybe @ShadowySpirits has other features are required to initiate a PoC with opendal-java.

[tisonkun]

Reader/Writer

I don't think so. If we further integrate with other interfaces or frameworks, we may do that. But Java doesn't provide such abstractions. InputStream/OutputStream may be, but I don't have a good idea here.

append

Can you share a link to the Rust append method?

[suyanhanx]

Can you share a link to the Rust append method?

https://opendal.apache.org/docs/rust/opendal/struct.Operator.html#method.append