[Feature Request] Add support to separate segment infos snapshot from remote segment metadata

[sachinpkale]

Is your feature request related to a problem? Please describe

• Currently, in remote backed index, we upload segment metadata to remote store which also contains SegmentInfosSnapshot.
• This was done as part of [Remote Segment Store] Combine metadata and snapshot files #7777 to keep metadata and SegmentInfos consistent with each other.
• By combining metadata and SegemntInfosSnapshot, we are combining data and metadata and this coupling will create issue s where we try to use separate remote stores for data and metadata ([Remote Store] Add support to provide separate segment metadata repository #12993)

Describe the solution you'd like

• The inconsistency problem existed as we used to overwrite metadata and SegmentInfosSnapshot files for a given segment generation.
• In [Remote Segment Store] Make metadata file immutable #8363, we made metadata file immutable.
• Using the same concept of immutability, we can separate out SegmentInfosSnapshot and avoid the inconsistency problem.

Related component

Storage:Remote

Describe alternatives you've considered

No response

Additional context

No response