Fix custom ImageLoading functions with default arguments not being called

[nuno-vieira]

🔗 Issue Links

#2692

📝 Summary

When providing a custom ImageLoading implementation, some of the functions were not being called. This is because the default implementations provided through the extension in the protocol were using default arguments in the declaration, and this makes Swift think that it is a different function. So the solution is to provide additional declarations without the arguments, which can have default values.

🧪 Manual Testing Notes

N/A for manual QA. Unit Tests were added to proof it works.

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• This change follows zero ⚠️ policy (required)
• This change should be manually QAed
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (docusaurus, tutorial, CMS)

[sonarcloud]

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