[Feature] Add GCS Hosting Integration

[tjwald]

We want to contribute an Aspire Hosting Integration for GCS. This is the proposed API:

var projectId = builder.AddParameter("project-id");
// Optional initDataDirectory
var gcs = builder.AddGcs("gcs", projectId, certPath: "path/to/ssl/cert", initDataDirectory: "path/to/preinitialize/content/directory");

//optional custom templating of bucket name
var bucket = gcs.AddBucket("bucket-name", ReferenceExpression.Create($"{projectId}-bucket-name"));

//usage - supports WaitFor and environment passing for buckets
var service = builder.AddContainer(...)
    .WithEnvironemnt("GCP_PROJECT_ID", gcs.Resource.ProjectId)
    .WithEnvironment("GCS_BUCKET_NAME", bucket)
    .WaitFor(bucket); // will wait for bucket creation

if (builder.ExecutionContext.IsRunMode)
{
    service
        .WithEnvironment("GCS_ENDPOINT", gcs) // will automatically pass the correct endpoint
        .WithEnvironment("GCP_APPLICATION_CREDENTIALS", "path/to/ssl/cert")
}

[github-actions]

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[tjwald]

Closing as discussed in Discord - not relevant for the community toolkit

[tjwald]

@maddymontaquila @aaronpowell since the aspire roadmap now clearly states gcp support, and since we have advanced on our end to support more emulators in local development, would you like to reopen this issue and for us to contribute our gcp package?

Right now we support:

1. Gcs- with bucket child resource
2. Pubsub - with topic and subscriber child resources
3. Bigtable
4. Bigquery
5. Firestore
6. Datastore
7. Secret manager - with secret child resource
8. Spanner
9. Gcp Viewer for 4 services (Gcs, pubsub, firestore and datastore).