[gl][Android] Fix integration with reanimated

[lukmccall]

Why

Fixes integration with reanimated.
This PR fixes three problems discovered when trying the fix example in the NCL.

How

• The GLView.getWorkletContext isn't correctly shared between js on the UI thread. I've decided to replace it with a global one.
• enableExperimentalWorkletSupport wasn't enabled on our test view.
• Assets weren't correctly converted into a sharable object because reanimated doesn't support moving prototypes between threads.

Test Plan

• NCL ✅

Screen.Recording.2024-04-24.at.12.23.19.mov

[expo-bot]

The Pull Request introduced fingerprint changes against the base commit: 915a89d

Fingerprint diff

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