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Adding resource subscriptions:
* Updated architecture.md
* In server/index.ts
- imported Transport, setSubscriptionHandlers,beginSimulatedResourceUpdates, and stopSimulatedResourceUpdates
- call setSubscriptionHandlers passing server
- in returned object,
- refactor/renamed startNotificationIntervals placehodler to clientConnected, which takes a transport argument and calls beginSimulatedResourceUpdates, passing the transport
- replaced cleanup placeholder with a function that takes an optional sessionId and calls stopSimulatedResourceUpdates, passing the sessionId
* In sse.ts, stdio.ts, and streamableHttp.ts
- when transport is connected, called clientConnect, passing transport
- when disconnecting, called cleanup, passing sessionId
* Added subscriptions.ts
- tracks subscriber session id lists by URI
- tracks transport by session id
- tracks subscription update intervals by sessionId
- in setSubscriptionHandlers
- set request handlers for SubscribeRequestSchema and UnsubscribeRequestSchema
- in beginSimulatedResourceUpdates
- starts an interval to send updates to the transport for all subscribed resources
- in stopSimulatedResourceUpdates
- removes intervals and transport for gien session id