feat: add customFetch

[mrtungdev]

…tion to support custom fetch function

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring

Motivation

Changes Made

• Add customFetch

Testing

• Unit tests added/updated
• Manual testing completed
• Tested on Web
• Tested on React Native
• Tested on Node.js

Checklist

• Code follows the style guidelines
• Self-review completed
• Comments added for complex code
• Documentation updated
• No new warnings generated
• Tests pass locally (npm test)
• Build succeeds (npm run build)
• Linter passes (npm run lint)

Screenshots (if applicable)

Additional Notes

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