Feat: add UseEmulator to the storage SDK

[AustinBenoit]

Description

Add support for Firebase Storage emulator via UseEmulator.

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Testing

Describe how you've tested these changes. Link any manually triggered Integration tests or CPP binary SDK Packaging Github Action workflows, if applicable.

Tested this manually via unity for Desktop, Android, iOS. See the photos below:

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

[gemini-code-assist]

Summary of Changes

Hello @AustinBenoit, 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 adds a significant new feature to the Firebase Storage SDK: the ability to connect to a local Firebase Storage emulator. This enhancement is crucial for improving the developer experience by enabling local testing and development workflows, reducing reliance on live Firebase services, and potentially speeding up iteration cycles. The change involves adding a public method to configure the emulator's host and port.

Highlights

• Firebase Storage Emulator Support: Introduced a new UseEmulator method to the Firebase Storage SDK, allowing developers to configure the SDK to connect to a local Storage emulator instead of the default remote backend. This method should be invoked before any other operations on a new Storage instance.

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[gemini-code-assist]

Code Review

This pull request adds support for using the Firebase Storage emulator by introducing a UseEmulator method. The implementation is straightforward and includes corresponding documentation updates. My review focuses on improving the code quality and correctness. I've pointed out a syntax error in the XML documentation that would break doc generation and an indentation inconsistency. Addressing these points will improve the code's maintainability and correctness.

[a-maurice]

LGTM, but since we have a release coming up without the C++ change, it might make sense to wait until that is done before committing this.