Store modes and back-sync:

- Back-sync blocks to `Config::min_epochs_for_block_requests` in standard
  storage mode
- Back-sync blob sidecars to `Config::min_epochs_for_blob_sidecars_requests`
- Track & filter peers that don't serve blocks prior to
  `Config::min_epochs_for_block_requests` when performing full back-sync
- Remove `Feature::TrustBackSyncBlocks`
- Verify signatures of back-synced blocks
- Move back-sync status to `Store`
- Relocate `received_blob_sidecars` and `received_block_roots` caches from `p2p::Network` to `p2p::BlockSyncService`
- Extend `SyncBatch` with `retry_count` and `responses_received` fields
- Use smaller back-sync batches when syncing with blobs
- Don't validate signature of genesis block
- Track state archival progress in database to be able to resume it
  after restart
- Don't request data from busy peers

DB:

- Add db-info command to inspect the Sync database
- Replace read-only boolean flag with more descriptive `DatabaseMode` enum

Other:

- Panic to trigger app-restart if network thread is down
- Handle exit signal in an archiver thread & batch archiver updates to db
- Rename `RequestType` to `RPCRequestType` as it conflicts with updated `eth2_libp2p`
- Log peer reporting in debug log
- Log minimal back-sync info when starting back-sync
- Don't log RPC received blocks to info logs (too much output during syncing)