[client,management] Feature/client service expose (#5411)

CLI: new expose command to publish a local port with flags for PIN, password, user groups, custom domain, name prefix and protocol (HTTP default).
Management/API: create/renew/stop expose sessions (streamed status), automatic naming/domain, TTL renewals, background expiration, new management RPCs and client methods.
UI/API: account settings now include peer_expose_enabled and peer_expose_groups; new activity codes for peer expose events.

proxy/management_integration_test.go

@@ -247,6 +247,22 @@ func (m *storeBackedServiceManager) GetServiceIDByTargetID(ctx context.Context,
 	return "", nil
 }
 
+func (m *storeBackedServiceManager) ValidateExposePermission(_ context.Context, _, _ string) error {
+	return nil
+}
+
+func (m *storeBackedServiceManager) CreateServiceFromPeer(_ context.Context, _, _ string, _ *reverseproxy.Service) (*reverseproxy.Service, error) {
+	return &reverseproxy.Service{}, nil
+}
+
+func (m *storeBackedServiceManager) DeleteServiceFromPeer(_ context.Context, _, _, _ string) error {
+	return nil
+}
+
+func (m *storeBackedServiceManager) ExpireServiceFromPeer(_ context.Context, _, _, _ string) error {
+	return nil
+}
+
 func strPtr(s string) *string {
 	return &s
 }