[misc] Move shared components to shared directory (#4286)

Moved the following directories:

```
  - management/client → shared/management/client
  - management/domain → shared/management/domain
  - management/proto → shared/management/proto
  - signal/client → shared/signal/client
  - signal/proto → shared/signal/proto
  - relay/client → shared/relay/client
  - relay/auth → shared/relay/auth
```

and adjusted import paths

shared/management/client/rest/impersonation_test.go

@@ -0,0 +1,77 @@
+//go:build integration
+// +build integration
+
+package rest_test
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/netbirdio/netbird/shared/management/client/rest"
+	"github.com/netbirdio/netbird/management/server/http/api"
+)
+
+var (
+	testImpersonatedAccount = api.Account{
+		Id: "ImpersonatedTest",
+		Settings: api.AccountSettings{
+			Extra: &api.AccountExtraSettings{
+				PeerApprovalEnabled: false,
+			},
+			GroupsPropagationEnabled:        ptr(true),
+			JwtGroupsEnabled:                ptr(false),
+			PeerInactivityExpiration:        7,
+			PeerInactivityExpirationEnabled: true,
+			PeerLoginExpiration:             24,
+			PeerLoginExpirationEnabled:      true,
+			RegularUsersViewBlocked:         false,
+			RoutingPeerDnsResolutionEnabled: ptr(false),
+		},
+	}
+)
+
+func TestImpersonation_Peers_List_200(t *testing.T) {
+	withMockClient(func(c *rest.Client, mux *http.ServeMux) {
+		impersonatedClient := c.Impersonate(testImpersonatedAccount.Id)
+		mux.HandleFunc("/api/peers", func(w http.ResponseWriter, r *http.Request) {
+			require.Equal(t, r.URL.Query().Get("account"), testImpersonatedAccount.Id)
+			retBytes, _ := json.Marshal([]api.Peer{testPeer})
+			_, err := w.Write(retBytes)
+			require.NoError(t, err)
+		})
+		ret, err := impersonatedClient.Peers.List(context.Background())
+		require.NoError(t, err)
+		assert.Len(t, ret, 1)
+		assert.Equal(t, testPeer, ret[0])
+	})
+}
+
+func TestImpersonation_Change_Account(t *testing.T) {
+	withMockClient(func(c *rest.Client, mux *http.ServeMux) {
+		impersonatedClient := c.Impersonate(testImpersonatedAccount.Id)
+		mux.HandleFunc("/api/peers", func(w http.ResponseWriter, r *http.Request) {
+			require.Equal(t, r.URL.Query().Get("account"), testImpersonatedAccount.Id)
+			retBytes, _ := json.Marshal([]api.Peer{testPeer})
+			_, err := w.Write(retBytes)
+			require.NoError(t, err)
+		})
+		_, err := impersonatedClient.Peers.List(context.Background())
+		require.NoError(t, err)
+
+		impersonatedClient = impersonatedClient.Impersonate("another-test-account")
+		mux.HandleFunc("/api/peers/Test", func(w http.ResponseWriter, r *http.Request) {
+			require.Equal(t, r.URL.Query().Get("account"), "another-test-account")
+			retBytes, _ := json.Marshal(testPeer)
+			_, err := w.Write(retBytes)
+			require.NoError(t, err)
+		})
+
+		_, err = impersonatedClient.Peers.Get(context.Background(), "Test")
+		require.NoError(t, err)
+	})
+}