Give preferred sequencer the ability to process "deferred blobs" early

[preston-evans98]

Description

This PR adds functionality to the BlobStorage module allowing the preffered_sequencer to request that some number of deferred_blobs be processed early.

As a reminder, blobs which are sent by someone other than the preferred sequencer are usually stored in state for some number of slots (DEFERRED_SLOTS_COUNT) before being processed. This is to ensure that they don't "front-run" the preferred sequencer, invalidating its soft confirmations.

This PR allows the preferred sequencer to specify a minimum number of such "deferred blobs" for the rollup to process during the next block. Note that this change does not allow the preferred sequencer to censor, since he can only set a lower bound on the number of deferred blobs to be processed. Deferred blobs will always be processed no later than DEFERRED_SLOTS_COUNT after appearing on the DA layer. If the preferred sequencer requests more blobs than are in the current deferred queue, the queue will be emptied.

Linked Issues

• Related to Based Sequencing with Soft Confirmations #408

Testing

Tests have been added

[codecov]

Codecov Report

Merging #1072 (1853f65) into nightly (b94c95b) will decrease coverage by 0.1%.
The diff coverage is 81.0%.

Files	Coverage Δ
...module-implementations/sov-blob-storage/src/lib.rs	98.3% <100.0%> (+0.8%)	⬆️
...-implementations/sov-sequencer-registry/src/lib.rs	98.3% <100.0%> (+0.3%)	⬆️
module-system/sov-modules-api/src/capabilities.rs	64.7% <0.0%> (-35.3%)	⬇️
...odule-implementations/sov-blob-storage/src/call.rs	53.3% <53.3%> (ø)
...plementations/sov-blob-storage/src/capabilities.rs	87.7% <84.0%> (-5.7%)	⬇️

... and 3 files with indirect coverage changes