feat: support collection restore in backup/restore process

[dwong2708]

Resolves: #385

Description

This PR enables importing collections into Learning Core from the contents of a TOML file.
This ensures that library structures can be consistently restored from backup definitions.

Input

test2.zip

Django Admin Output

Collection

Collection entities

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[ormsbee]

Why is this "type: ignore" necessary?

[dwong2708]

Good catch — it shouldn’t be there. Fixed, thanks!