refactor(java-sdk): restructure java template

[piotrooo]

Description

As the first step of #476, we introduce well-formatted Java SDK template files to mimic the real (or nearly real) generated Java SDK file structure.

Introduced structure:

.
├── docs
├── example
│   └── example1
│       ├── gradle
│       │   └── wrapper
│       ├── links
│       └── src
│           └── main
│               ├── java
│               │   └── dev
│               │       └── openfga
│               │           └── sdk
│               │               └── example
│               ├── kotlin
│               │   └── dev
│               │       └── openfga
│               │           └── sdk
│               │               └── example
│               └── resources
├── libraries
│   └── native
└── src
    ├── main
    │   ├── api
    │   │   ├── auth
    │   │   ├── client
    │   │   │   └── model
    │   │   └── configuration
    │   ├── errors
    │   ├── telemetry
    │   └── util
    ├── test
    │   ├── api
    │   │   ├── auth
    │   │   ├── client
    │   │   └── configuration
    │   ├── telemetry
    │   └── util
    └── test-integration
        ├── api
        │   └── client
        └── resources

@jimmyjames I saw that you committed something directly to the java-sdk repo. Will you backport your changes after this PR will be merged, or I should wait, and rebase? If so, please align sdk-generator with java-sdk, and I'll rebase it.

References

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

[jimmyjames]

👋 hey @piotrooo thanks for the contribution!

Yeah, I sometimes have a bad habit of making changes directly to the SDK when no generated models are needed, and then porting back to the generator 😑.

I'm going to get the generator synced up today and get a new release of the java SDK out; I'll report back when that's done and then yeah, if you wouldn't mind rebasing that would be great.

[jimmyjames]

Ok, generator and SDK are back in sync, if you want to rebase the PR we can get this in before any more changes 😄

[piotrooo]

@jimmyjames done ✅ rebased with main.

One question: should I add anything to the changelog?

Yeah, I sometimes have a bad habit of making changes directly to the SDK when no generated models are needed, and then porting back to the generator 😑.

No worries? I noticed that a lot of team members have been doing that 🤷‍♂️ Maybe someday, everyone will follow this point in the contribution guide 😉

be created and modified through pull requests to this sdk-generator repository instead of individual repositories.

[jimmyjames]

One question: should I add anything to the changelog?

No, since there are is nothing functionally changing with the SDK (I verified there are no changes to the SDK), no changelog entry is needed.

I noticed that a lot of team members have been doing that 🤷‍♂️ Maybe someday, everyone will follow this point in the contribution guide 😉

Yeah, we as a team need to be be better about this, and holding each other accountable :)

[jimmyjames]

😍 love it, thanks @piotrooo! 🙇