[Tiered Caching][Milestone 1] Refactor Tiered caching interfaces

[sgup432]

Is your feature request related to a problem? Please describe

As part of initial Tiered caching framework, we had exposed StoreAwareCache(link) and tiered spillover cache framework(link) which has all the logic to spill evicted items to the disk tier.

While reviewing further changes here and elsewhere, we discussed whether StoreAwareCache is really needed as it exposes cacheStoreType which shouldn't be needed to the consumer. And also ideally tieredSpilloverCache should be moved to a module as it is optional and not required to be within OpenSearch core. Considering we are now also maintaining cache stats within cache itself(link) instead of using a listener based approach, all this required following changes as mentioned below.

Describe the solution you'd like

So as part of this issue we will refactor following:

• Move TieredSpilloverCache to a module
• Remove StoreAwareCache interface and not expose CacheStoreType in core.
• Remove listener for hits/misses/evictions
• Provide a way for any type of cache(IndicesRequestCache for example) to initialize any kind of ICache via setting based mechanism.

Related component

Search:Performance

Describe alternatives you've considered

No response

Additional context

No response

[sgup432]

@msfroh

[peternied]

[Triage - attendees 1 2 3 4 5 6 7 8]
@sgup432 Thanks for opening up this issue for follow up, looking forward to these improvements.

[stephen-crawford]

@opensearch-project/opensearch-core I believe this can be closed.

[getsaurabh02]

@sgup432 should we close this out?