feat(goff): add Faraday instrumentation

[avelicka]

This PR

This PR adds Faraday instrumentation configuration.

Example:

OpenFeature::GoFeatureFlag::Options.new(
  endpoint: "http://localhost:1031",
  instrumentation: { name: 'custom_name', instrumenter: MyInstrumenter }
)

[gemini-code-assist]

Summary of Changes

Hello @avelicka, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the capability to configure Faraday instrumentation within the GoFeatureFlag OpenFeature provider. This enhancement allows developers to easily integrate custom instrumentation middleware into the HTTP client used by the provider, enabling advanced monitoring, logging, or tracing of network requests made to the GoFeatureFlag relay-proxy.

Highlights

• Faraday Instrumentation Support: The provider now supports configuring Faraday instrumentation, allowing users to integrate custom monitoring or logging for HTTP requests made by the GoFeatureFlag client.
• New Configuration Option: A new instrumentation option has been added to OpenFeature::GoFeatureFlag::Options, which can be used to pass a hash containing instrumentation details to the Faraday client.
• Documentation and Testing: The README.md has been updated to reflect the new instrumentation configuration option, and a new unit test ensures the option is correctly handled.

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[gemini-code-assist]

Code Review

This pull request adds support for Faraday instrumentation, allowing for better monitoring of HTTP requests made by the provider. The changes are well-structured, passing the new instrumentation option from the provider's Options down to the Faraday connection setup. I've added a couple of suggestions to improve the robustness of the new option handling by adding validation and to strengthen the corresponding test case. Overall, this is a great addition.

[thomaspoignant]

Looks good to me, this is a great addition to the provider.