feat: Count override-affected evaluations separately and send no individual events for them

[kinyoklion]

Summary

The OVERRIDE specification marks an evaluation as override-affected when any definition it read came from the SDK's override store. Such an evaluation appears in summary events only: it produces no individual feature event and no debug event, whatever the flag's configuration requests, and it is counted in a separate summary counter that carries an overrideAffected marker, so override-affected and ordinary evaluations of the same flag, variation, and version are never collapsed together.

• Event.FeatureRequest carries the marking as a boolean that the SDK sets from its evaluation result. The existing constructors keep working and leave it false; toDebugEvent() keeps the value.
• DefaultEventProcessor keys individual feature event and debug event emission on the marking. Index events and summaries are unchanged.
• EventSummarizer keeps a second set of counters per flag for marked evaluations, created on first use so unmarked flags pay nothing. EventOutputFormatter writes overrideAffected: true only on those counters, the same way the unknown marker is written.
• EventSummarizerInterface gains the marker parameter and keeps the previous signature as a default method that delegates with false.

Flag overrides are currently experimental and subject to change. The server SDK change that sets the marking depends on the release of this package.

SDK-3246

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Note

Overview
Adds override-affected handling for flag evaluations tied to the experimental override store: Event.FeatureRequest carries an overrideAffected flag (existing constructors default to false).

DefaultEventProcessor still summarizes and emits index events, but suppresses individual feature and debug events whenever isOverrideAffected() is true, regardless of trackEvents or debug configuration.

EventSummarizer (and aggregated/per-context wrappers) buckets those evaluations in a separate counter map per flag so they are not merged with normal counts for the same version/variation; EventOutputFormatter emits overrideAffected: true only on those summary counters.

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[kinyoklion]

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