Optimize Layer Loading State Propagation and Event Handling

[dsuren1]

Description

Improve layer loading performance for maps with a large number of layers by batching loading events, reducing unnecessary state updates and selector recalculations, and minimizing redundant UI rendering during tile load events.

The enhancement includes:

• Batch onLayerLoading and onLayerLoad events across OpenLayers, and Cesium using a component-level HOC with deduplication, reducing redundant dispatches
• Pass batched layer IDs directly from OpenLayers/Cesium instead of dispatching multiple actions for coalesced layers.
• Avoid unnecessary layer and transient state updates when the loading state has not changed.
• Reduce selector and UI recalculation by consuming layer loading state directly where required, including MapLoading and the TOC.
• Buffer high-frequency OpenLayers tile load completion events to reduce dispatch bursts.

What kind of improvement you want to add? (check one with "x", remove the others)

• Minor changes to existing features
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Other useful information

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