[Tiered Caching][Milestone 1] Tiered caching support for RequestCache

[sgup432]

Is your feature request related to a problem? Please describe.
This is a sub issue which tracks milestone 1 as part of bigger proposal mentioned here - #10024

This covers below

• As part of this milestone 1, we are planning to cover Request cache as it is more of a simplistic cache.
• We will provide disk tier support. We will plan to use an opensource embedded caching library for this.
• We will reuse existing OpenSearch in-memory cache with LRU based eviction policy. Evicted items will be spilled over to disk based cache.

This is being targetted for 2.12

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