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/"
    ......

[netlify]

✅ Deploy Preview for kurator-dev ready!

Name	Link
🔨 Latest commit	dd45e9e
🔍 Latest deploy log	https://app.netlify.com/sites/kurator-dev/deploys/66cd91329acee6000823b90d
😎 Deploy Preview	https://deploy-preview-683--kurator-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[LiZhenCheng9527]

almost lgtm

[LiZhenCheng9527]

Even if request-success-tare and request-duration are not available, you can use the metrics that come with the gateway without customising them.
Both scenarios should be made clear

[LiZhenCheng9527]

/lgtm

[hzxuzhonghu]

/lgtm

[kurator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hzxuzhonghu

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [hzxuzhonghu]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment