Make go-git opt-in

[justinsb]

What would you like to be added:

I propose we make go-git an optional dependency, per https://github.com/GoogleCloudPlatform/k8s-config-connector/pull/1080 . I think we have seen that most controllers don't rely on go-git, and instead use the built-in channels. Controllers that do use go-git should be able to do so easily by opting-in.

Why is this needed:

Minimizing core dependencies.

[justinsb]

Proposed design:

• Create an alternative loader which just loads from a channels directory.
• Create an alternative loader where we can add https or git support explicitly.
• Refactor go-git dependency into its own package (in particular) so it isn't part of the core dependency set.
• Extend the addons.Init call with a new mandatory argument, that is the loader to use. By making it a mandatory argument, we deliberately force users to choose the loader as part of a kdp upgrade.

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to [this](https://github.com/kubernetes-sigs/kubebuilder-declarative-pattern/issues/366#issuecomment-2142641399): >The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs. > >This bot triages issues according to the following rules: >- After 90d of inactivity, `lifecycle/stale` is applied >- After 30d of inactivity since `lifecycle/stale` was applied, `lifecycle/rotten` is applied >- After 30d of inactivity since `lifecycle/rotten` was applied, the issue is closed > >You can: >- Reopen this issue with `/reopen` >- Mark this issue as fresh with `/remove-lifecycle rotten` >- Offer to help out with [Issue Triage][1] > >Please send feedback to sig-contributor-experience at [kubernetes/community](https://github.com/kubernetes/community). > >/close not-planned > >[1]: https://www.kubernetes.dev/docs/guide/issue-triage/ 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.