feat(ios): add priority support for image loading

[Navipro70]

Summary

This PR adds support for the priority prop on iOS, allowing developers to control image loading priority using Nuke's ImageRequest.Priority.

Supported values:

• veryLow
• low
• normal (default)
• high
• veryHigh

Use case

This allows developers to prioritize important images (like hero images or above-the-fold content) over less important ones (like thumbnails in a long list that are off-screen).

Usage

import TurboImage, { Priority } from 'react-native-turbo-image';

// High priority for hero image
<TurboImage 
  source={{ uri: 'https://example.com/hero.jpg' }}
  priority="high"
/>

// Low priority for thumbnails in a list
<TurboImage 
  source={{ uri: 'https://example.com/thumbnail.jpg' }}
  priority="low"
/>

Changes

• ios/TurboImageView.swift: Added priority property and parseRequestPriority() method to convert string values to ImageRequest.Priority
• ios/TurboImageViewManager.m: Exported the priority property to React Native
• src/types.ts: Added Priority type and priority prop to TurboImageProps
• src/index.tsx: Exported Priority type
• src/TurboImage.tsx: Added priority prop handling

Notes

• This is iOS-only for now. Android support could be added in a future PR using Glide's priority system.
• Default priority is normal when not specified.

[Navipro70]

I didn't find built in priority feature in coil to implement it on android, since I don't have any Android native experience to implement this feature (if it's possible by the way), will appreciate if anyone who experienced more can help and implement it by himself or even give the doc how to design it, maybe I will find the way to do it with LLM

Anyway, I think we can merge this PR without android

[duguyihou]

Thanks. Would you like to add a new screen to demonstrate it in the example project?

[duguyihou]

Can we have a untiliy function or enum to handle this? this function is written twice.

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