[store] Introduce Epoch store adapter #9876

Job	Run time
Protobuf Backward Compatibility	10s
Cargo Nextest (Linux)	10m 43s
Backward Compatibility	11m 46s
Cargo Nextest (Linux Nightly)	11m 3s
Database Migration	11m 57s
Cargo Fmt	21s
Protocol Schema	13m 41s
Genesis Changes	10m 36s
Sanity Checks	6m 12s
Style	33s
Upgradability	12m 28s
Cargo Audit	25s
Cargo Deny	33s
Cargo Clippy	8m 50s
Non-default Configuration Builds	1m 17s
Themis	41s
Unused Dependencies	7m 15s
Rust Doctests	11m 26s
Cargo check publishable packages separately (Linux, linux, ubuntu-latest)	9m 13s
Cargo check publishable packages separately (Windows, win, windows-latest)	2m 51s
spellcheck	26s
Generate Coverage Artifact (unit, unit)	2m 34s
Upload Coverage	17s
	2h 15m 18s

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