chore: Separate the provisionerd server into it's own package (#4940)

* chore: Separate the provisionerd server into it's own package

This code should be thoroughly tested now that we understand the abstraction.

I separated it to make our lives a bit easier for external provisioner daemons
as well!

* Add tests

* Add workspace builds

* Add test for workspace resources

coderd/workspaceresourceauth.go

@@ -11,6 +11,7 @@ import (
 	"github.com/coder/coder/coderd/azureidentity"
 	"github.com/coder/coder/coderd/database"
 	"github.com/coder/coder/coderd/httpapi"
+	"github.com/coder/coder/coderd/provisionerdserver"
 	"github.com/coder/coder/codersdk"
 
 	"github.com/mitchellh/mapstructure"
@@ -130,7 +131,7 @@ func (api *API) handleAuthInstanceID(rw http.ResponseWriter, r *http.Request, in
 		})
 		return
 	}
-	var jobData workspaceProvisionJob
+	var jobData provisionerdserver.WorkspaceProvisionJob
 	err = json.Unmarshal(job.Input, &jobData)
 	if err != nil {
 		httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{