[FSSDK-11513] limit number of events in the eventStore

[raju-opti]

Summary

• saving failed events in the event store indefinitely might cause an app to consume too much storage space. This PR limits the number of events stored in the eventStore.

Test plan

• added tests

Issues

• FSSDK-11513

[Copilot]

Pull Request Overview

This PR limits the number of events stored in the event store to prevent excessive storage use. Key changes include:

• Adding a new log message (EVENT_STORE_FULL) for cases when the event store reaches capacity.
• Implementing event count management via eventCountInStore and a dedicated storeEvent method with logic to skip storing events when the maximum is reached.
• Updating tests to cover scenarios when the event store limit is met and when store saves fail.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
lib/message/log_message.ts	Added new log message constant for full event store notification.
lib/event_processor/batch_event_processor.ts	Introduced event store capacity logic (eventCountInStore, storeEvent) and replaced dispatchingEventIds with dispatchingEvents.
lib/event_processor/batch_event_processor.spec.ts	Added tests covering event store limits and failure conditions.

[Copilot]

The check 'this.eventCountInStore' may fail when the count is 0 (since 0 is falsy), which could prevent the intended decrement. Consider replacing it with 'this.eventCountInStore !== undefined' to ensure the condition works correctly even when the count is 0.

Suggested change

	if (!event.notStored && this.eventCountInStore) {
	if (!event.notStored && this.eventCountInStore !== undefined) {

[Copilot]

[nitpick] If the 'ids' array is no longer needed after switching to 'events', please consider removing the commented code to improve code clarity.

Suggested change

// ids: currentBatch.map((e) => e.id),

[coveralls]

coverage: 80.428% (-0.3%) from 80.685%
when pulling 67d0c18 on raju/event_store_limit
into 3c63d79 on master.

[junaed-optimizely]

LGTM! Its a nice optimization!