[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/users.go

@@ -0,0 +1,107 @@
+package rest
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+
+	"github.com/netbirdio/netbird/management/server/http/api"
+)
+
+// UsersAPI APIs for users, do not use directly
+type UsersAPI struct {
+	c *Client
+}
+
+// List list all users, only returns one user always
+// See more: https://docs.netbird.io/api/resources/users#list-all-users
+func (a *UsersAPI) List(ctx context.Context) ([]api.User, error) {
+	resp, err := a.c.NewRequest(ctx, "GET", "/api/users", nil, nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[[]api.User](resp)
+	return ret, err
+}
+
+// Create create user
+// See more: https://docs.netbird.io/api/resources/users#create-a-user
+func (a *UsersAPI) Create(ctx context.Context, request api.PostApiUsersJSONRequestBody) (*api.User, error) {
+	requestBytes, err := json.Marshal(request)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := a.c.NewRequest(ctx, "POST", "/api/users", bytes.NewReader(requestBytes), nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[api.User](resp)
+	return &ret, err
+}
+
+// Update update user settings
+// See more: https://docs.netbird.io/api/resources/users#update-a-user
+func (a *UsersAPI) Update(ctx context.Context, userID string, request api.PutApiUsersUserIdJSONRequestBody) (*api.User, error) {
+	requestBytes, err := json.Marshal(request)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := a.c.NewRequest(ctx, "PUT", "/api/users/"+userID, bytes.NewReader(requestBytes), nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[api.User](resp)
+	return &ret, err
+}
+
+// Delete delete user
+// See more: https://docs.netbird.io/api/resources/users#delete-a-user
+func (a *UsersAPI) Delete(ctx context.Context, userID string) error {
+	resp, err := a.c.NewRequest(ctx, "DELETE", "/api/users/"+userID, nil, nil)
+	if err != nil {
+		return err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+
+	return nil
+}
+
+// ResendInvitation resend user invitation
+// See more: https://docs.netbird.io/api/resources/users#resend-user-invitation
+func (a *UsersAPI) ResendInvitation(ctx context.Context, userID string) error {
+	resp, err := a.c.NewRequest(ctx, "POST", "/api/users/"+userID+"/invite", nil, nil)
+	if err != nil {
+		return err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+
+	return nil
+}
+
+// Current gets the current user info
+// See more: https://docs.netbird.io/api/resources/users#retrieve-current-user
+func (a *UsersAPI) Current(ctx context.Context) (*api.User, error) {
+	resp, err := a.c.NewRequest(ctx, "GET", "/api/users/current", nil, nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+
+	ret, err := parseResponse[api.User](resp)
+	return &ret, err
+}