Support for 429 rate limit response

[theknut]

When hitting a rate limit configured in the GitLab instance, the api throws a GitLabException

GitLabException: GitLab server returned an error (TooManyRequests): Response cannot be deserialized (429 - Too many requests, see: https://gitlab.example.com/settings/#rate-limits
). Original call: Get https://gitlab.example.com/api/v4/projects/:projectid/jobs/:jobid/trace

The retry-after header provides the wait time for the client. Please implement a retry after the specified timeout to handle rate limits.

Further links:
https://docs.gitlab.com/security/rate_limits/
https://docs.gitlab.com/administration/settings/user_and_ip_rate_limits/#response-headers (useful for clients)

Some existing API client implementations:
https://github.com/python-gitlab/python-gitlab/blob/3859aa0ff3a77b31651b770585f5cfe81c9d244a/gitlab…
https://github.com/jdalrymple/gitbeaker/blob/1724338a8b2bb195a0e90868fa35ef37d29f8ae3/packages/rest…
https://gitlab.com/gitlab-org/api/client-go/-/blob/main/gitlab.go#L608-704