[ncl] Some improvements to the hash placeholders demo (#22134)

Co-authored-by: Tomasz Sapeta <[email protected]>

[expo-image] Add ThumbHash support (#21952)

# Why

Previously we were only supporting BlurHash, we want the users to be
able to use ThumbHash as well.

# How

Copied the ThumbHash code from t

[expo-image] Add ThumbHash support (#21952)

# Why

Previously we were only supporting BlurHash, we want the users to be
able to use ThumbHash as well.

# How

Copied the ThumbHash code from the [ThumbHash
repo](https://github.com/evanw/thumbhash) and implemented the
functionality into `iOS`, `Android` and `web` similarly to BlurHash.
Changed the demo app to include more images

# Test Plan

Tested on Android, iOS and Web.

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Co-authored-by: Expo Bot <[email protected]>

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