(ReBAC library) Initialize ReBAC Admin UI Backend library

[babakks]

This PR creates a separate Go module encompassing the *ReBAC Admin UI Backend` library. Essentially, this library implements HTTP handlers according to the ReBAC Admin UI OpenAPI spec and delegates the actual operation (authorization or manipulating OpenFGA tuples) to custom implementations plugged in via pre-defined interfaces.

Since the library is meant to be a reusable component and will later be extracted into a separate repository, we try to keep it as a separate/independent Go module. Note that, to make it play nice with the main Go module in the repo's root, we had to use Go Workspaces. After the library is extracted, we can delete the Go Workspace.

Fixes CSS-7248

[shipperizer]

@babakks can u rewrite the commits to follow the conventional commits standard?

reason is that our release process uses those for drafting a release

[babakks]

@babakks can u rewrite the commits to follow the conventional commits standard?

reason is that our release process uses those for drafting a release

Yeah, sure. I usually try keeping my commits as small as possible, so at times it might be a bit difficult to pick/find an accurate commit message type (e.g., fix or feat). But I'll do my best.

[shipperizer]

@babakks can u rewrite the commits to follow the conventional commits standard?

reason is that our release process uses those for drafting a release

Yeah, sure. I usually try keeping my commits as small as possible, so at times it might be a bit difficult to pick/find an accurate commit message type (e.g., fix or feat). But I'll do my best.

don't sweat it, just put fix if it s a minor change or chore if u think it s irrelevant

[babakks]

@alesstimec @shipperizer Sorry for the --force push.

[babakks]

I removed the OpenAPI spec copy, and now we have it embedded within the auto-generated types.

[babakks]

I also removed the Go Workspace because it causes some conflicts with the other parts of the repository (e.g., go generate directives with -mod=mod option). Since we don't want to touch other parts of the repo for this library, we'd better off keeping the library as a package inside the main Go module.

[babakks]

Just one more update. I also generated the server part (handlers and routes). I think it's done now and we can merge it if it's okay with you. @alesstimec @shipperizer

[babakks]

UPDATE: The /swagger.json endpoint is now added to the ReBAC Admin OpenAPI spec.

[babakks]

Reworded the commits. Please have a look. @shipperizer

[shipperizer]

@babakks I think u forgot to force push, there are still 31 commits instead of 3

[babakks]

Sorry, I thought your suggesting commit message rewording. I'll rebase and push with 3 or so commits.

[babakks]

@shipperizer Done.