feat: add Datadog Go, .NET, and PHP providers

[jonathannorris]

Adds Datadog's official Go, .NET, and PHP OpenFeature providers to the ecosystem.

The existing Kotlin entry continues to represent Datadog's Android provider, matching the repository's current technology naming.

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Reviewing files that changed from the base of the PR and between c03774f and dcb86ad.

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• src/datasets/providers/datadog.ts

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