fix: make MLKit scanner initialization lazy to prevent memory consumption overload

[ItsChaceD]

Description

This PR fixes an issue where the MLKit scanner can get backlogged when processing the camera frames and run out of memory

Context

#30

Type of changes

• Fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Refactor (cosmetic changes)
• Breaking change (change that would cause existing functionality to not work as expected)

Platforms affected

• Android
• iOS
• JavaScript

Tests

Tested on Android 12 Xiaomi device and Android 16 Pixel 8 Pro

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