Add library registration for chasm callback (#8577)

## What changed?
CHASM library registration for callbacks

## Why?
pre-cursor to integration w/ mutable state

## How did you test it?
- [ ] built
- [ ] run locally and tested manually
- [ ] covered by existing tests
- [ ] added new unit test(s)
- [ ] added new functional test(s)

## Potential risks
None, not in running code yet.

Author: spkane31

chasm/lib/callback/fx.go

@@ -0,0 +1,22 @@
+package callback
+
+import (
+	"go.temporal.io/server/chasm"
+	"go.uber.org/fx"
+)
+
+func Register(
+	registry *chasm.Registry,
+	library *Library,
+) error {
+	return registry.Register(library)
+}
+
+var Module = fx.Module(
+	"chasm.lib.callback",
+	fx.Provide(ConfigProvider),
+	fx.Provide(NewInvocationTaskExecutor),
+	fx.Provide(NewBackoffTaskExecutor),
+	fx.Provide(NewLibrary),
+	fx.Invoke(Register),
+)

chasm/lib/callback/library.go

@@ -0,0 +1,53 @@
+package callback
+
+import (
+	"go.temporal.io/server/chasm"
+	"google.golang.org/grpc"
+)
+
+type (
+	Library struct {
+		chasm.UnimplementedLibrary
+
+		InvocationTaskExecutor *InvocationTaskExecutor
+		BackoffTaskExecutor    *BackoffTaskExecutor
+	}
+)
+
+func NewLibrary(
+	InvocationTaskExecutor *InvocationTaskExecutor,
+	BackoffTaskExecutor *BackoffTaskExecutor,
+) *Library {
+	return &Library{
+		InvocationTaskExecutor: InvocationTaskExecutor,
+		BackoffTaskExecutor:    BackoffTaskExecutor,
+	}
+}
+
+func (l *Library) Name() string {
+	return "callback"
+}
+
+func (l *Library) Components() []*chasm.RegistrableComponent {
+	return []*chasm.RegistrableComponent{
+		chasm.NewRegistrableComponent[*Callback]("callback"),
+	}
+}
+
+func (l *Library) Tasks() []*chasm.RegistrableTask {
+	return []*chasm.RegistrableTask{
+		chasm.NewRegistrableSideEffectTask(
+			"invoke",
+			l.InvocationTaskExecutor,
+			l.InvocationTaskExecutor,
+		),
+		chasm.NewRegistrablePureTask(
+			"backoff",
+			l.BackoffTaskExecutor,
+			l.BackoffTaskExecutor,
+		),
+	}
+}
+
+func (l *Library) RegisterServices(server *grpc.Server) {
+}