This commit addresses a potential integer overflow issue when converting int64
values to uint64 for 'slot' and 'epoch' fields in
`DistinctBeaconBadBlockValues` and `DistinctBeaconBlockValues` functions.
It also fixes a validation logic in the config to ensure that at least one
agent configuration is provided.

This commit introduces a graceful shutdown mechanism for the
permanent store, ensuring that all queued blocks are processed
before the store is stopped. It also adds a stopped flag to
prevent new blocks from being queued after the stop signal is
received. Additionally, it increases the number of goroutines
processing the queue to improve performance.

This commit renames the "*PermanentStoreBlock" components to
"*BlockInfo" for clarity and consistency. This change affects
the BeaconBadBlockInfo, BeaconBlockInfo, and
ExecutionBadBlockInfo components, as well as their import and
usage in the Info part.

fix(permanent_store.go): add retry mechanism for acquiring lock
test(permanent_store_test.go): add process channel to test queue