chore: refactor sdk bridge

[tariknz]

Only publishes requested telemetry

When an overlay subscribes to a telemetry key on the telemetry store, IPC message is sent to the backend and the SDK will now append taht key to publish to that overlay.

After this change only the telemetry values that are needed are published to the windows for each overlay.

graph TD
    A[iRacing SDK] -->|Raw Telemetry Data| B[IRacingSDK Bridge]
    B -->|Full Telemetry Object| C[OverlayManager]
    
    D[Frontend Overlay] -->|useTelemetryFieldTracker hook| E[TelemetryStore]
    E -->|subscribeToTelemetryFields| F[IPC: subscribe-telemetry-fields]
    F -->|IPC Message| G[TelemetryBridge]
    G -->|Overlay ID + Fields| H[OverlayManager]
    
    H -->|Track Subscriptions| I[fieldSubscriptions Map]
    H -->|Track Field Mappings| J[fieldToOverlays Map]
    
    C -->|publishTelemetryFields| K{For each telemetry field}
    K -->|Check fieldToOverlays| L[Get subscribed overlays]
    L -->|Create OverlayTelemetryPayload| M[Send only subscribed fields]
    M -->|Targeted IPC| N[Specific Overlay Window]
    
    N -->|telemetry event| O[Frontend TelemetryProvider]
    O -->|Update TelemetryStore| P[Component re-renders]
    
    Q[Overlay Cleanup] -->|unsubscribeFromTelemetryFields| H
    H -->|Remove from maps| R[Clean up subscriptions]
    
    style A fill:#e1f5fe
    style D fill:#f3e5f5
    style H fill:#fff3e0
    style M fill:#e8f5e8

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