feat: Add OpenFGA server version to fga --version command

[Siddhant-K-code]

Description

This PR adds the OpenFGA server version display to the fga --version command. When the CLI is configured with an API URL, it will show both the CLI version and the server version.

Changes

• Added GetServerVersion function to retrieve server version
• Modified version command to display server version when available
• Added proper error handling and "unknown" fallback

Example Output

$ fga --version
fga CLI version v0.2.6 (commit: dc4e39648ec5b626fc5c44c4f9f77a1e15806ab7, date: 2024-02-28T12:47:25Z)
openfga version v1.5.0

If the server version cannot be retrieved, it will display:

$ fga --version
fga CLI version v0.2.6 (commit: dc4e39648ec5b626fc5c44c4f9f77a1e15806ab7, date: 2024-02-28T12:47:25Z)
openfga version v unknown

References

fixes #274

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

[Siddhant-K-code]

These should be fixed by #485 soon

[rhamzeh]

You're printing out the Store ID - what we want is the actual OpenFGA server version.

There's 2 of those, remote and local.

The remote it is impossible to do without server support. The local version, there may be a way to print out the version (from the go.mod/go.sum entry), but I don't think it's going to be straightforward.