[Proposal] add panel loading state indicator support

Walkthrough

The recent changes enhance the CustomPanel and related components by introducing new hooks for managing loading states and active event counts. The usePanelLoading and useActivePanelEventsCount hooks improve interactivity and responsiveness, ensuring that the UI reflects the current loading status. Additionally, the implementation of an atom for tracking event counts strengthens state management capabilities, enriching the overall user experience within the application.

Changes

Files	Change Summary
`app/packages/operators/src/CustomPanel.tsx`, `app/packages/operators/src/hooks.ts`, `app/packages/operators/src/state.ts`	Introduced `usePanelLoading` and `useActivePanelEventsCount` hooks, enhancing loading state management and event counting. Added `activePanelsEventCountAtom` to track event counts using Recoil's state management.
`app/packages/operators/src/usePanelEvent.ts`	Modified `usePanelEvent` to integrate the new hooks for better event tracking and refined type definitions.
`app/packages/spaces/src/components/PanelTab.tsx`, `app/packages/spaces/src/hooks.ts`, `app/packages/spaces/src/state.ts`	Added loading state management with `usePanelLoading` hook and `panelsLoadingStateAtom`. Updated the `PanelTab` component to conditionally render loading indicators.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant PanelTab
    participant CustomPanel
    participant usePanelLoading
    participant useActivePanelEventsCount

    User->>PanelTab: Interacts with panel
    PanelTab->>usePanelLoading: Check loading state
    usePanelLoading-->>PanelTab: Returns loading status
    PanelTab->>CustomPanel: Render based on loading state
    CustomPanel->>useActivePanelEventsCount: Get active event count
    useActivePanelEventsCount-->>CustomPanel: Returns event count
    CustomPanel->>PanelTab: Updates UI accordingly

Poem

🐇 In a panel so sleek,
Events dance and peek,
Loading states now shine bright,
With hooks that bring delight!
A rabbit’s hop through code,
Makes the user experience explode! 🌟

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voxel51 / fiftyone