Register `PackageSpecification.PackageGroupContents` for Skycache value-sharing
During Skycache frontier serialization, `PackageSpecification.PackageGroupContents` (and its generated `@AutoValue` subclass `AutoValue_PackageSpecification_PackageGroupContents`) was previously serialized inline via `DynamicCodec` whenever referenced by package visibility specifications or `NestedSet<PackageGroupContents>` nodes. Across a single build graph, 30,798 `PackageGroupContents` instances were serialized inline (despite only 2,861 unique instances), accounting for 3.14 MB (205,770 cumulative objects) of wire data.
This change:
- Annotates `PackageSpecification.PackageGroupContents` with `@AutoCodec` and adds a `@VisibleForSerialization @AutoCodec.Instantiator` factory method (`createForSerialization`) returning `AutoValue_PackageSpecification_PackageGroupContents`.
- Registers `PackageGroupContents.class` in `SerializationRegistrySetupHelpers.AUTOCODEC_CLASSES_FOR_VALUE_SHARING` so `PackageGroupContents` instances are deduplicated across Skyframe nodes via `ValueSharingAdapter`.
- Adds `PackageGroupTest.testPackageGroupContentsCodec` to verify round-trip serialization and reference-identity deduplication (`isSameInstanceAs`) with `SerializationRegistrySetupHelpers.analysisCachingCodecs()`.
Before:
```java
@AutoValue
public abstract static class PackageGroupContents
implements NestedSetsShouldBeInternedByEquality {
// Serialized inline via DynamicCodec without value-sharing across Skyframe nodes.
}
```
After:
```java
@AutoCodec
@AutoValue
public abstract static class PackageGroupContents
implements NestedSetsShouldBeInternedByEquality {
@VisibleForSerialization
@AutoCodec.Instantiator
static PackageGroupContents createForSerialization(...) {
return new AutoValue_PackageSpecification_PackageGroupContents(...);
}
}
```
PiperOrigin-RevId: 1008249881
Change-Id: I07a674af764898a5d48ce1ab98dc9fafca7ea709
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