Restrict Server Messages to Initialized Clients with Appropriate Capabilities

[tzolov]

Ensure that server sends notifications only to initialized clients with appropriate capabilities

Expected Behavior

• Send notifications only to initialized clients
• For client initiated request/response operations (e.g. all server features) return a single response only to the client-session that has initiated the request.
• Send Root and Sampling requests only to the client that initiated the current session and only if they provide those capabilities

Current Behavior

Server broadcasts notifications and requests without checking:

• Client initialization state
• Client capabilities
• Session ownership

[tzolov]

Resolved by #31