Update attachment package

[joshua-journey-apps]

This a port of the Swift, Dart and Kotlin attachment's API to the JS SDK.

This addresses the following issues #715 and #714 by adding the meta_data column to the table and persisting it in the attachments table.

It is currently still a work-in-progress so there are a couple things that still needs to be done:

• Update demos
• Improve testing
• Update the readme
• Implement sync throttling
• Implement clearing archived attachments
• Removing some holdovers from the previous implementation

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Latest commit: 958675a

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