Implementation of the resourceUtil mode for the progressive rollout

[houshengbo]

Fixed: #160

• The default mode to roll out a new revision is availability, making sure that service availability is the top priory. It will scale up the pods of the new revision first and then scale down the pods of the old revision.
• This PR implemented another mode: resourceUtil to roll out a new revision. This mode makes sure that resource usage is the top priory. It will scale down the pods of the old revision first and then scale up the pods of the new revision.

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: houshengbo

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/knative-extensions/serving-progressive-rollout/blob/main/OWNERS)~~ [houshengbo] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 33.20312% with 171 lines in your changes are missing coverage. Please review.

Project coverage is 48.83%. Comparing base (5c8bcbb) to head (7ed6ef5). Report is 20 commits behind head on main.

Files	Patch %	Lines
...onciler/rolloutorchestrator/strategies/strategy.go	0.00%	139 Missing :warning:
.../reconciler/rolloutorchestrator/strategies/base.go	79.59%	18 Missing and 2 partials :warning:
...onciler/rolloutorchestrator/rolloutorchestrator.go	0.00%	8 Missing :warning:
pkg/reconciler/rolloutorchestrator/controller.go	0.00%	3 Missing :warning:
pkg/reconciler/service/service.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #167 +/- ## ========================================== - Coverage 49.42% 48.83% -0.60% ========================================== Files 23 25 +2 Lines 2280 1894 -386 ========================================== - Hits 1127 925 -202 + Misses 1109 924 -185 - Partials 44 45 +1 ```

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[houshengbo]

/cherry-pick release-1.13

[knative-prow-robot]

@houshengbo: once the present PR merges, I will cherry-pick it on top of release-1.13 in a new PR and assign it to you.

In response to [this](https://github.com/knative-extensions/serving-progressive-rollout/pull/167#issuecomment-2097180836): >/cherry-pick release-1.13 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[yuzisun]

/lgtm

[knative-prow-robot]

@houshengbo: new pull request created: #173

In response to [this](https://github.com/knative-extensions/serving-progressive-rollout/pull/167#issuecomment-2097180836): >/cherry-pick release-1.13 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.