Get block authentication information for past blocks

[tomyrd]

There's an edge case where we sync before we import the note and the note's block does not have any relevant notes for the client. So the MMR won't get updated and while we'll have the merkle path for the note, we won't be able to build the authentication path for the note's block.

Originally posted by @mFragaBA in #297 (comment)

[igamigo]

Changed the title a bit. This is currently blocked by 0xPolygonMiden/miden-node#256

[mFragaBA]

closing as #337 got merged