[WIP] Bicep Templates for ACR, KeyVault, AppGW, and AKS

[teilmeier]

Here are Bicep Templates based on the acr-stamp and cluster-stamp ARM templates. Currently the flux part is commented out and the version is a few commits behind the main branch. But I think it's a good starting point.

[ckittel]

Awesome timing. We have an engineer currently working on this right now. @magrande, can you please coordinate your work with this contribution?

[ckittel]

The work to convert this repo into bicep has two phases. The first is an in-place migration from JSON to bicep. The second will be to refactor into modules as is the norm for bicep and as is proposed here in this PR. We will be keeping a separation though between the ACR deployment and the cluster (unlike proposed here) to continue to teach the importance of bootstrapping resources being available to the cluster prior to the cluster being deployed.

@teilmeier, we'd love to have you join us on this phased migration, aligning with the work we've got in our backlog for this. We have resources already allocated to the migration and a project plan (and style guide, etc). As seen by the work done by @magrande in #286. If you would like to help us accelerate the migration, please reach out to me so we can coordinate the work and not run into any duplicated efforts (like what just happened) and we can also make sure no rework is necessary (and risk is minimized) by following the phased migration approach. Please reach out to me on Teams to discuss next steps. Welcome aboard!

[I'm going to convert this PR to DRAFT/WIP to indicate it's just a collaboration PR at this point.]

[teilmeier]

Restructured my fork repo's branches. I'll create a new PR containing the Bicep-related changes