feat: clustered segments DataSegment changes and PartialLoadMatcher

[clintropolis]

Description

Companion PR to #19460 that adds adds the DataSegment changes so that clustered segments are visible to coordinators/brokers and a PartialLoadMatcher implementation that can use wildcards to match cluster groups for partial loads.

[clintropolis]

if this PR goes in after #19461 it needs adjusted to use the PartialLoadSpec base type introduced there (likewise if this is merged first that PR needs to update)

[FrankChen021]

Severity	Findings
P0	0
P1	0
P2	1
P3	0
Total	1

Reviewed 19 of 19 changed files.

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This is an automated review by Codex GPT-5.5

[FrankChen021]

[P2] Keep the existing public constructor signature

This inserts clusterGroups into the public constructor that previously took (... projections, ShardSpec, CompactionState, ...). DataSegment is annotated @publicapi, and extension or application code can construct projection-aware segments with that old signature; after this change those callers either fail to compile or, if already compiled, hit NoSuchMethodError even though they do not use cluster groups. Please keep the old overload and delegate with clusterGroups = null instead of replacing the existing public signature.

[clintropolis]

fine, I can add it... DataSegment is a bit of a graveyard of deprecated constructors and builder creators though... we need to delete these at some point and just call it out in release notes. I would expect creating DataSegment directly is kind of uncommon in extensions (outside of tests at least).

[capistrant]

+1 with or without the DataSegment constructor business

[FrankChen021]

I reviewed the follow-up on the DataSegment constructor compatibility thread and the current incremental update. The previous public constructor overload has been restored and delegates with clusterGroups = null, so the original concern is handled.

Reviewed 4 of 19 changed files.

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This is an automated review by Codex GPT-5.5