Add CBOR and agent initiated WebSocket connections (#51, #490, #646, #845, etc)

- Add version exchange between hub and agent.
- Introduce ConnectionManager for managing WebSocket and SSH connections.
- Implement fingerprint generation and storage in agent.
- Create expiry map package to store universal tokens.
- Update config.yml configuration to include tokens.
- Enhance system management with new methods for handling system states and alerts.
- Update front-end components to support token / fingerprint management features.
- Introduce utility functions for token generation and hub URL retrieval.

Co-authored-by: nhas <jordanatararimu@gmail.com>

beszel/internal/common/common-ssh.go

@@ -0,0 +1,10 @@
+package common
+
+var (
+	// Allowed ssh key exchanges
+	DefaultKeyExchanges = []string{"curve25519-sha256"}
+	// Allowed ssh macs
+	DefaultMACs = []string{"hmac-sha2-256-etm@openssh.com"}
+	// Allowed ssh ciphers
+	DefaultCiphers = []string{"chacha20-poly1305@openssh.com"}
+)