Add metadata to Agents / ToolServers and apply to the deployments

[g3force]

When deploying agents and tools in a cluster, I would like to add some annotations and labels to the deployments or pods.

Proposal: Add commonMetadata and podMetadata to the spec of Agent, ToolServer, AiGateway, AgentGateway and ToolGateway.

Implement the reconciliation for agents and toolServers.