[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/accounts.go

@@ -0,0 +1,60 @@
+package rest
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+
+	"github.com/netbirdio/netbird/management/server/http/api"
+)
+
+// AccountsAPI APIs for accounts, do not use directly
+type AccountsAPI struct {
+	c *Client
+}
+
+// List list all accounts, only returns one account always
+// See more: https://docs.netbird.io/api/resources/accounts#list-all-accounts
+func (a *AccountsAPI) List(ctx context.Context) ([]api.Account, error) {
+	resp, err := a.c.NewRequest(ctx, "GET", "/api/accounts", nil, nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[[]api.Account](resp)
+	return ret, err
+}
+
+// Update update account settings
+// See more: https://docs.netbird.io/api/resources/accounts#update-an-account
+func (a *AccountsAPI) Update(ctx context.Context, accountID string, request api.PutApiAccountsAccountIdJSONRequestBody) (*api.Account, error) {
+	requestBytes, err := json.Marshal(request)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := a.c.NewRequest(ctx, "PUT", "/api/accounts/"+accountID, bytes.NewReader(requestBytes), nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[api.Account](resp)
+	return &ret, err
+}
+
+// Delete delete account
+// See more: https://docs.netbird.io/api/resources/accounts#delete-an-account
+func (a *AccountsAPI) Delete(ctx context.Context, accountID string) error {
+	resp, err := a.c.NewRequest(ctx, "DELETE", "/api/accounts/"+accountID, nil, nil)
+	if err != nil {
+		return err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+
+	return nil
+}