Blob retrieval by versioned hash

[terencechain]

Currently, in the construction of retrieving a blob, the request is based on the block ID, which can be either a block root or specific keywords like "finalized" or "justified." However, it would be beneficial for L2 in general to have the ability to retrieve blobs using versioned hashes. This would address a pain point for L2 mapping, as L2s primarily focus on versioned hashes and it would be more sensible to use them as the request parameter rather than beacon block roots