feat: Add targeting match split reason

[AleksandrasMaliuginas-vinted]

This PR

• adds TARGETING_MATCH_SPLIT reason

Notes

This reason is used in go-feature-flag lib: https://github.com/thomaspoignant/go-feature-flag/blob/916ae7747b17a62dc904ee6a5f02a57c7147da25/modules/core/flag/resolution_reason.go#L15

[gemini-code-assist]

Summary of Changes

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This pull request enhances the OpenFeature provider by adding a new resolution reason, TARGETING_MATCH_SPLIT. This addition provides more granular detail for feature flag evaluations, specifically when a flag's value is determined by a percentage-based dynamic evaluation. This change aims to improve compatibility and reporting for external feature flag systems, such as the go-feature-flag library, that utilize this specific resolution type.

Highlights

• New Resolution Reason: A new TARGETING_MATCH_SPLIT reason has been introduced to the openfeature/provider.go file. This reason is intended for dynamic evaluations that resolve to a percentage split.

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[gemini-code-assist]

Code Review

This pull request introduces a new Reason constant, TargetingMatchSplitReason, to the openfeature/provider.go file. This new reason indicates that a resolved flag value was the result of a dynamic evaluation that resolves to a percentage split. There are no review comments to address.