feat: Deprecate the provider getState method

[kinyoklion]

FeatureProvider#getState() is deprecated in the OpenFeature Java SDK, but this provider overrode it without marking it deprecated, so consumers got no signal to migrate.

• Marks the getState() override @Deprecated and documents Client#getProviderState() as the replacement
• Behavior is unchanged; the override is kept so existing callers keep getting real state rather than the SDK's READY default
• Removes the deprecation warning emitted when compiling this provider

@cursor review

Implementation details

Context

The OpenFeature SDK now tracks provider state itself, from initialize and from the events this provider emits (ready/stale/error/configuration changed), which is why FeatureProvider#getState() carries @Deprecated with "The state is handled by the SDK internally. Query the state from the Client instead."

Alternatives considered

Deleting the override entirely: rejected for now because FeatureProvider supplies a default that always returns READY, so any consumer still calling provider.getState() would silently get a wrong answer. Deprecating first gives a migration path; the override can be dropped in a future major.

Testing

./gradlew test javadoc — all 44 tests pass and javadoc builds with no new warnings.

No visual preview applies — this is a server-side provider change.

Link to Devin session: https://app.devin.ai/sessions/0c452d209ec54b068ba120b4c92b8f6c
Requested by: @kinyoklion

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Note

Overview
Aligns this LaunchDarkly OpenFeature server provider with the OpenFeature Java SDK by marking the getState() override @Deprecated and documenting Client#getProviderState() as the replacement.

The override remains so callers still receive accurate provider state instead of the SDK default READY; behavior is unchanged aside from deprecation signaling and cleaner compilation (no missing-deprecation warning on this override).

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