HHH-20773 Resolve UNFETCHED_PROPERTY for initialized lazy fields during 2LC disassembly

[stalep]

…ng 2LC disassembly

When a @immutable + @Cacheable entity has a @basic(fetch = FetchType.LAZY) field AND collection/entity associations (@manytomany, @manytoone), the lazy field is never served from the second-level cache.

Every access triggers initializeLazyPropertiesFromDatastore a DB round-trip, even though @Cache(includeLazy=true) is the default and isLazyPropertiesCacheable() returns true.

For @immutable entities with @Cache(includeLazy=true) (the default), the lazy field value should be included in the StandardCacheEntryImpl.disassembledState when the entity is first persisted (since the value is set by the application and can never change). Subsequent loads from the 2LC should serve the value from cache without a DB round-trip.

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Please make sure that the following tasks are completed:
Tasks specific to HHH-20773 (Improvement):

• Add tests for feature/improvement
• Update documentation as relevant: javadoc for changed API, documentation/src/main/asciidoc/userguide for all features, documentation/src/main/asciidoc/introduction for main features, links from existing documentation
• Add entries as relevant to migration-guide.adoc (breaking changes) and whats-new.adoc (new features/improvements)

https://hibernate.atlassian.net/browse/HHH-20773

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