new feature: Expose conditional writes for Java bindings

[geruh]

Feature Description

Currently, the java bindings is missing some write options including the conditional writes.

Problem and Solution

This would allow for users to use the operators to conditionally write data to specified locations

Additional Context

No response

Are you willing to contribute to the development of this feature?

• Yes, I am willing to contribute to the development of this feature.

[Xuanwo]

I will invite @tisonkun and @G-XD to participate in the API design first. Are there any special considerations when adding more options to our write API? Is it complex to implement such support?

In rust side, we use conditional writes in the way like:

op.write_with(path).if_not_exists(true).await;
op.write_with(path).if_none_match(etag).await;

Or passing it into a writer:

let w = op.writer_with(path).if_not_exists(true).await;
let w = op.writer_with(path).if_none_match(etag).await;

The links to API: https://docs.rs/opendal/latest/opendal/operator_futures/struct.OperatorFuture.html#method.if_not_exists-1

[geruh]

Hey @Xuanwo, yeah, I was testing it out locally by passing in some write options similar to the approach taken in #4785 for the Node.js bindings. Granted, they don’t have conditional writes yet, but I've added some additional options. You can check my local fork here: https://github.com/geruh/opendal/tree/java-write-options. I can open a PR if @tisonkun and @G-XD think this approach looks correct.

[tisonkun]

@geruh I don't check your branch yet but it's generally encouraged to submit a PR So that we can browse the changeset and continue the concrete discussion there.