…of-bodies

Similar to the consensus p2p spec, a by-range request allows execution
clients to store finalized blocks in linear by-number storage instead of
relying on by-hash indices, significantly increasing efficiency in
fetching them from cold storage.

Clients whose database design does not permit efficient by-number
lookups may opt to not implement this call, but must then give a
well-known error code allowing consensus later clients to fall back to a
less efficient method of fetching the blocks.

This specification assumes that execution clients know nothing of slot
numbers as seen on the consensus layer. Should execution clients later
learn about these, the specification may be amended to work with slot
numbers instead.

Until then, consensus clients must be careful to compute block numbers
correctly.

Consensus clients must also be careful when this request is used to
fetch non-finalized blocks, reverting to by-root requests if an
unexpected chain is returned.

Co-authored-by: Mikhail Kalinin <[email protected]>

Co-authored-by: Mikhail Kalinin <[email protected]>