feat(remote-config): add optional exposurePercent field to ExperimentValue

[tusharkhandelwal8]

feat(remote-config): add exposurePercent to ExperimentValue interface

Add optional exposurePercent field to ExperimentValue to expose the
percentage of users included in an experiment. This follows up on #3046
which introduced the ExperimentValue type.

[gemini-code-assist]

Summary of Changes

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This pull request introduces a new optional field, exposurePercent, to the ExperimentValue interface within the Remote Config module. This enhancement provides the capability to define and track the percentage of users targeted by an experiment, improving the expressiveness and utility of experiment configurations. The change is fully documented and supported by updated unit tests.

Highlights

• New Field Added: An optional exposurePercent field has been added to the ExperimentValue interface, allowing the specification of the percentage of users included in an experiment.
• API Documentation Updated: The API documentation for ExperimentValue has been updated to reflect the inclusion of the new exposurePercent field.
• Unit Tests Enhanced: Unit tests for Remote Config have been updated to include and assert the exposurePercent field in ExperimentValue objects, ensuring proper functionality.

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[gemini-code-assist]

Code Review

This pull request adds an optional exposurePercent field to the ExperimentValue interface, allowing the SDK to expose the percentage of users included in an experiment. The changes include updating the interface definition and its corresponding API documentation, as well as updating unit tests to cover the new field. The implementation is straightforward and correct. I have one suggestion to improve the documentation for the new field to ensure its correct usage.