[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/peers.go

@@ -0,0 +1,108 @@
+package rest
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+
+	"github.com/netbirdio/netbird/management/server/http/api"
+)
+
+// PeersAPI APIs for peers, do not use directly
+type PeersAPI struct {
+	c *Client
+}
+
+// PeersListOption options for Peers List API
+type PeersListOption func() (string, string)
+
+func PeerNameFilter(name string) PeersListOption {
+	return func() (string, string) {
+		return "name", name
+	}
+}
+
+func PeerIPFilter(ip string) PeersListOption {
+	return func() (string, string) {
+		return "ip", ip
+	}
+}
+
+// List list all peers
+// See more: https://docs.netbird.io/api/resources/peers#list-all-peers
+func (a *PeersAPI) List(ctx context.Context, opts ...PeersListOption) ([]api.Peer, error) {
+	query := make(map[string]string)
+	for _, o := range opts {
+		k, v := o()
+		query[k] = v
+	}
+	resp, err := a.c.NewRequest(ctx, "GET", "/api/peers", nil, query)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[[]api.Peer](resp)
+	return ret, err
+}
+
+// Get retrieve a peer
+// See more: https://docs.netbird.io/api/resources/peers#retrieve-a-peer
+func (a *PeersAPI) Get(ctx context.Context, peerID string) (*api.Peer, error) {
+	resp, err := a.c.NewRequest(ctx, "GET", "/api/peers/"+peerID, nil, nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[api.Peer](resp)
+	return &ret, err
+}
+
+// Update update information for a peer
+// See more: https://docs.netbird.io/api/resources/peers#update-a-peer
+func (a *PeersAPI) Update(ctx context.Context, peerID string, request api.PutApiPeersPeerIdJSONRequestBody) (*api.Peer, error) {
+	requestBytes, err := json.Marshal(request)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := a.c.NewRequest(ctx, "PUT", "/api/peers/"+peerID, bytes.NewReader(requestBytes), nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[api.Peer](resp)
+	return &ret, err
+}
+
+// Delete delete a peer
+// See more: https://docs.netbird.io/api/resources/peers#delete-a-peer
+func (a *PeersAPI) Delete(ctx context.Context, peerID string) error {
+	resp, err := a.c.NewRequest(ctx, "DELETE", "/api/peers/"+peerID, nil, nil)
+	if err != nil {
+		return err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+
+	return nil
+}
+
+// ListAccessiblePeers list all peers that the specified peer can connect to within the network
+// See more: https://docs.netbird.io/api/resources/peers#list-accessible-peers
+func (a *PeersAPI) ListAccessiblePeers(ctx context.Context, peerID string) ([]api.Peer, error) {
+	resp, err := a.c.NewRequest(ctx, "GET", "/api/peers/"+peerID+"/accessible-peers", nil, nil)
+	if err != nil {
+		return nil, err
+	}
+	if resp.Body != nil {
+		defer resp.Body.Close()
+	}
+	ret, err := parseResponse[[]api.Peer](resp)
+	return ret, err
+}