feat: support ramping up write API requests

[rhamzeh]

Description

On fga tuple write we now support the following flags: --max-rps and --rampup-period-in-sec. If one is set, both are required.

e.g. --max-rps 10 --rampup-period-in-sec 10

If these flags are set the CLI will start ramping up requests from 1RPS to the configured max RPS over the configured period

References

closes #463

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

[stacklok-cloud]

Minder Vulnerability Report ✅

Minder analyzed this PR and found it does not add any new vulnerable dependencies.

Vulnerability scan of 52abcf46:

• 🐞 vulnerable packages: 0
• 🛠 fixes available for: 0