[feature request] Ratelimit server should support Redis Credentials Providers

[DerekTBrown]

Context

Many projects/cloud providers are moving towards short-lived token-based credentials for Redis authentication:

• AWS
• Google

Feature Request: Redis Credentials Providers

• To implement this effectively, services that create a Redis client need to have a "hook" to repeatedly obtain refreshed auth credentials.
• Ratelimiting service should have some capability to do this: whether implementing provider-specific ways of obtaining Redis tokens, or allowing the user to provide a script or callback for obtaining a short-lived credential.

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged "help wanted" or "no stalebot" or other activity occurs. Thank you for your contributions.

[github-actions]

This issue has been automatically closed because it has not had activity in the last 37 days. If this issue is still valid, please ping a maintainer and ask them to label it as "help wanted" or "no stalebot". Thank you for your contributions.