feat: add .NET Aspire integration for KubeOps operators

[msexxeta]

Summary

• add KubeOps.Aspire service defaults for operator telemetry, service discovery, resilience, and health checks
• add KubeOps.Aspire.Hosting with AddKubeOps<TProject>, RunWithKubernetes(...), and PublishAsKubernetesOperator(...)
• integrate KubeOps-generated CRDs, RBAC, and service accounts into Aspire Kubernetes publish/deploy output while keeping Aspire as the owner of the operator Deployment
• document local, Azure/AKS, combined, and standalone publish-only scenarios

Validation

• dotnet test test\KubeOps.Aspire.Hosting.Test\KubeOps.Aspire.Hosting.Test.csproj --no-restore
• dotnet test test\KubeOps.Aspire.Test\KubeOps.Aspire.Test.csproj --no-restore
• npm run build in docs succeeds; it still reports a pre-existing unrelated broken anchor in docs/operator/deployment
• manually verified earlier against local Kubernetes from Podman/kind, standalone publish without a Kubernetes environment or Helm, and AKS deploy in tenant e98c800b-fa26-4a4e-85c1-cd4aafbf5fac with temporary resources cleaned up afterwards

closes #926

[msexxeta]

Addressed the sample separation feedback: examples/Operator is back to being a plain KubeOps operator, and the Aspire sample now uses a dedicated examples/AspireOperator project referenced by examples/AspireAppHost.

I also updated the Aspire docs/README snippets to use Projects.AspireOperator so the examples line up with the new structure.

[kimpenhaus]

that looks pretty good to me in general - there are some minor things I'd like to recover

• the added debug processor in the operator sample as that fixes an unused using in release configuration.
• the two comments on the readme which were more precisely than the original text segments

thanks for your time @msexxeta

[msexxeta]

Restored the more precise README wording from the review:

• dotnet new operator is described as scaffolding, while the console path is manual setup plus KubeOps.Operator.
• Package targeting now distinguishes runtime libraries, build-time packages, and the Kubernetes client wording.

I also put the plain operator sample's KubeOps.Abstractions.Crds using back under #if DEBUG and verified the Release build is warning-free.

[kimpenhaus]

that's awesome - thanks 😄

[msexxeta]

Nice! This makes developing operaters much easier imo, especially when they are part of a bigger system.