Support dynamic (catch-all) workflows

Allow a PHP worker to register a dynamic (catch-all) workflow, invoked for
any workflow type name that has no statically registered handler. The host
already registers a single shared WorkflowDefinitionFactory proxy (wDef)
under each declared name; when a workflow is declared dynamic, register that
same proxy via worker.RegisterDynamicWorkflow instead (it forwards the real
workflow type name to PHP), and skip named registration for it.

WorkflowInfo gains a Dynamic field, populated from the "dynamic" key the PHP
GetWorkerInfo handshake emits.

This enables Dynamic Workflow support in the PHP SDK (PHP and TypeScript are
the only SDKs without it). Companion change: temporalio/sdk-php.

Depends on temporalio/sdk-go#2449 (issue #2448): RegisterDynamicWorkflow
accepts the factory, but go-sdk's dynamic execution path panics on it until
that fix ships. A go.temporal.io/sdk bump to the first release containing it
is required before dynamic dispatch runs.

Author: datashaman

aggregatedpool/workers.go

@@ -149,6 +149,24 @@ func TemporalWorkers(wDef *Workflow, actDef *Activity, wi []*internal.WorkerInfo
 		for j := 0; j < len(wi[i].Workflows); j++ {
 			wf := wi[i].Workflows[j]
 
+			// A dynamic workflow is the catch-all: register it via
+			// RegisterDynamicWorkflow (not by name) so it handles any workflow
+			// type that has no statically registered handler. The shared proxy
+			// (wDef) is a WorkflowDefinitionFactory, which RegisterDynamicWorkflow
+			// accepts; it forwards the real workflow type name to PHP.
+			if wf.Dynamic {
+				err := registerWorkflow(func() {
+					wrk.RegisterDynamicWorkflow(wDef, workflow.DynamicRegisterOptions{})
+				}, wf.Name, wi[i].TaskQueue)
+				if err != nil {
+					return nil, err
+				}
+
+				log.Debug("dynamic workflow registered", zap.String(tq, wi[i].TaskQueue), zap.Any("workflow name", wf.Name))
+
+				continue
+			}
+
 			err := registerWorkflow(func() {
 				wrk.RegisterWorkflowWithOptions(wDef, workflow.RegisterOptions{
 					Name:                          wf.Name,

internal/worker_info.go

@@ -33,6 +33,9 @@ type WorkflowInfo struct {
 	Signals []string `json:"signals"`
 	// VersioningBehavior for the workflow.
 	VersioningBehavior workflow.VersioningBehavior `json:"versioning_behavior,omitempty"`
+	// Dynamic marks this as the catch-all workflow, registered via
+	// RegisterDynamicWorkflow so it handles any otherwise-unregistered type.
+	Dynamic bool `json:"dynamic,omitempty"`
 }
 
 // ActivityInfo describes single worker activity.