feat(appcheck): Add new internal, default provider

[ncooke3]

No description provided.

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[ncooke3]

/gemini review

[ncooke3]

Any possible improvements to the Mac App user journey? Maybe asserting or returning nil with a log to use a custom provider?

[gemini-code-assist]

Code Review

This pull request introduces FIRDefaultProviderFactory to automatically select the App Check provider based on the execution environment, using the Debug provider for simulators and the DeviceCheck provider for devices. The automatic registration logic was moved from FIRDeviceCheckProviderFactory to this new factory. Corresponding unit tests were added to ensure correct provider instantiation. I have no feedback to provide.