Network::HeaderResponse does not contain hash

[Wollac]

Component

network, json-rpc

What version of Alloy are you on?

alloy-network v0.6.0

Operating System

None

Describe the bug

With the recent changes in #1573, there is no longer a way to get the block hash from a generic alloy_network::Network response. The HeaderResponse now only contains the actual header, but no additional fields like the hash.
I expected that there would be a wrapper (similar to alloy_rpc_types_eth::Header) that would either store this hash directly, or if for some reason this is considered too Ethereum specific, at least some other_fields mechanism. Such behavior would also be consistent with the BlockResponse, and previous versions of alloy allowed direct access to the hash.

[mattsse]

right, thanks for flagging.

imo @klkvr the easiest way to make this convenient is introducing a trait (HeaderResponse) or we can add some restriction to Sealed<&Self::Header>.

the former is likely easier.

perhaps we can introduce a general purpose trait for the hash, like Sealed but as a trait