Modify DA Interface to use SubmitBlobs from SubmitBlocks

[Manav-Aggarwal]

Need to change the below method across the DA interfaces and implementations:

SubmitBlocks(ctx context.Context, blocks []*types.Block)

to have this signature:

SubmitBlobs(ctx context.Context, blobs []*blob.Blob)

Currently, the block to blob conversion happens before submitting the blob to a DA layer. We'd like to instead do this conversion before even calling SubmitBlobs. This will be useful in #858 which will require the SignedHeader and data in different blobs and potentially even separate namespaces.

Note that the block to blob conversation should happen in manager.go.

[chandiniv1]

@Manav-Aggarwal Do we need to change signature of SubmitBlock in DA interface?

[Manav-Aggarwal]

Yes both the interface and implementation should use SubmitBlobs as part of this issue.

[Chirag018]

@Manav-Aggarwal would like to take this up!

[Manav-Aggarwal]

Thanks @Chirag018! Just assigned it to you and added some more context.