Add timeout attribute for prometheus metrics provider

[AhmedGrati]

Summary

Add timeout attribute in the Prometheus metric provider of the AnalysisTemplate. It would look something like this:

apiVersion: argoproj.io/v1alpha1
kind: AnalysisTemplate
metadata:
  name: success-rate
spec:
  args:
  - name: service-name
  metrics:
  - name: success-rate
    interval: 5m
    # NOTE: prometheus queries return results in the form of a vector.
    # So it is common to access the index 0 of the returned array to obtain the value
    successCondition: result[0] >= 0.95
    failureLimit: 3
    provider:
      prometheus:
        address: http://prometheus.example.com:9090
        timeout: 40

Use Cases

Can be useful when the query to the Prometheus server takes more than the default timeout which is 30 seconds.

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