message: Use deferral approach for blob cache clearing to reduce timer set/clears
  Modifying the approach to blob cache clearing to defer the clear if there are any reads before it fires. The clear will be delayed a bit, but in exchange we guarantee we won't set/clear too many timers.
diff: @@ -101,6 +101,10 @@ export class OdspDocumentStorageService implements IDocumentStorageService {
  // Save the timeout so we can cancel and reschedule it as needed
  private blobCacheTimeout: ReturnType<typeof setTimeout> | undefined;
  + // If the defer flag is set when the timeout fires, we'll reschedule rather than clear immediately
  + // This deferral approach is used (rather than clearing/resetting the timer) as current calling patterns trigger
  + // too many calls to setTimeout/clearTimeout.
  + private deferBlobCacheClear: boolean = false;
  private readonly attributesBlobHandles: Set<string> = new Set();
  @@ -784,14 +788,27 @@ export class OdspDocumentStorageService implements IDocumentStorageService {
  }
  /**
  - * Stop the current timer for clearing the blob cache (if any) and schedule a new one
  + * Schedule a timer for clearing the blob cache or defer the current one.
  */
  private scheduleClearBlobsCache() {
  - const blobCacheTimeoutDuration = 10000;
  if (this.blobCacheTimeout !== undefined) {
  - clearTimeout(this.blobCacheTimeout);
  + // If we already have an outstanding timer, just signal that we should defer the clear
  + this.deferBlobCacheClear = true;
  + } else {
  + // If we don't have an outstanding timer, set a timer
  + // When the timer runs out, we'll decide whether to proceed with the cache clear or reset the timer
  + const clearCacheOrDefer = () => {
  + this.blobCacheTimeout = undefined;
  + if (this.deferBlobCacheClear) {
  + this.deferBlobCacheClear = false;
  + this.scheduleClearBlobsCache();
  + } else {
  + this.blobCache.clear();
  + }
  + };
  + const blobCacheTimeoutDuration = 10000;
  + this.blobCacheTimeout = setTimeout(clearCacheOrDefer, blobCacheTimeoutDuration);
  }
  - this.blobCacheTimeout = setTimeout(() => { this.blobCache.clear(); }, blobCacheTimeoutDuration);
  }
  private checkSnapshotUrl() {
  