Create abstractions to handle Remote metadata#1

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linuxpi wants to merge 3 commits intosegment-md-header-footerfrom refactor-remote-metadata-handling

+411-23

Commits on Feb 9, 2023

Add header(codec, version) and footer(checksum) to remote store segment metadata
linuxpi
committed
Fix UTs to work with header and footer in segment metadata
linuxpi
committed

Commits on Feb 14, 2023

Create abstractions to handle Remote metadata
linuxpi
committed