Feat: Add customizable Metrics Analysis to the rollout API

[Gidi233]

What type of PR is this?

/kind api-change /kind feature

What this PR does / why we need it: Providing users with customizable Metrics Analysis enables users to flexibly adjust according to different needs and scenarios, ensuring that users can obtain more accurate analysis results that meet specific business applications, thereby improving the operability of the system and the accuracy of data analysis.

Which issue(s) this PR fixes: Fixes #681

Does this PR introduce a user-facing change?:

    ......
          trafficAnalysis:
             checkIntervalSeconds: 90
             checkFailedTimes: 2
             metrics:
             - name: request-success-rate
               intervalSeconds: 90
               thresholdRange:
                 min: 99
             - name: my-metric
               intervalSeconds: 90
               thresholdRange:
                 max: 99
               customMetric: 
                 provider: 
                   type: prometheus
                   address: http://flagger-prometheus.ingress-nginx:9090
                 query: |
                   sum(
                     rate(
                       http_requests_total{
                         status!~"5.*"
                       }[{{ interval }}]
                     )
                   )
                   /
                   sum(
                     rate(
                       http_requests_total[{{ interval }}]
                     )
                   ) * 100
             webhooks:
                 timeoutSeconds: 60
                 command:
                 - "hey -z 1m -q 10 -c 2 http://backend-canary.webapp:9898/"
    ......

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[LiZhenCheng9527]

/lgtm

[kurator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hzxuzhonghu

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