feat(alpenglow): enable blockstore BlockComponent parsing

[ksn6]

Problem and Summary of Changes

Today, blockstore purely interprets sequences of shreds as as Vec<Entry>. Alpenglow requires blocks to store BlockComponent instead:

#[derive(Debug, Clone, PartialEq, Eq)]
#[allow(clippy::large_enum_variant)]
pub enum BlockComponent {
    EntryBatch(Vec<Entry>),
    BlockMarker(VersionedBlockMarker),
}

Described in #10090, we take careful measures to ensure that the serialization scheme for BlockComponent::EntryBatch is identical to how we currently serialize Vec<Entry>.

Summary of Changes

This PR introduces functions which allow us to reason about shreds as BlockComponents.

Note: we do not introduce any logical changes to blockstore in this PR. In the near future, we'll modify blockstore processor to (1) detect whether migration has occurred, and if so, (2) interpret sequences of shreds as block components and replay accordingly.

[ksn6]

This is the key function.

• Today, we invoke get_slot_entries_with_shred_info in blockstore processor within confirm_slot during replay.
• With Alpenglow, we'll invoke get_slot_components_with_shred_info instead (we'll upstream this shortly).

[ksn6]

Diffs are rendered poorly - nothing logically changes about get_slot_entries_with_shred_info; we're factoring out logic common to block component parsing into the function get_slot_data_with_shred_info_common, which we then invoke here.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 52.23881% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.0%. Comparing base (cc15ab6) to head (7c2b61c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #10566     +/-   ##
=========================================
- Coverage    83.0%    83.0%   -0.1%     
=========================================
  Files         848      848             
  Lines      316606   316656     +50     
=========================================
+ Hits       262944   262953      +9     
- Misses      53662    53703     +41     

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[steviez]

Two smaller things from me, and I think Zach brought up a good point. I'm inclined to say that we should land the item Zach called out in a separate PR prior to this one

[ksn6]

Two smaller things from me, and I think Zach brought up a good point. I'm inclined to say that we should land the item Zach called out in a separate PR prior to this one

FYI: #10622 addresses this.

CC: @steviez @cpubot

[steviez]

With #10622 landed, would you mind rebasing on top of tip of master ? Don't think it will make much difference for CI or anything, but still doesn't hurt

[steviez]

This LGTM, but wouldn't mind grabbing explicit sign off from @cpubot as well

[cpubot]

LGTM