[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/geo.go

@@ -0,0 +1,40 @@
+package rest
+
+import (
+	"context"
+
+	"github.com/netbirdio/netbird/management/server/http/api"
+)
+
+// GeoLocationAPI APIs for Geo-Location, do not use directly
+type GeoLocationAPI struct {
+	c *Client
+}
+
+// ListCountries list all country codes
+// See more: https://docs.netbird.io/api/resources/geo-locations#list-all-country-codes
+func (a *GeoLocationAPI) ListCountries(ctx context.Context) ([]api.Country, error) {
+	resp, err := a.c.NewRequest(ctx, "GET", "/api/locations/countries", nil, nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[[]api.Country](resp)
+	return ret, err
+}
+
+// ListCountryCities Get a list of all English city names for a given country code
+// See more: https://docs.netbird.io/api/resources/geo-locations#list-all-city-names-by-country
+func (a *GeoLocationAPI) ListCountryCities(ctx context.Context, countryCode string) ([]api.City, error) {
+	resp, err := a.c.NewRequest(ctx, "GET", "/api/locations/countries/"+countryCode+"/cities", nil, nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[[]api.City](resp)
+	return ret, err
+}