feat: Import data via CSV

[dblythy]

New Pull Request Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am creating this PR in reference to an issue.

Issue Description

Currently, it's not possible to import data

Closes: #307

Approach

Adds ability to import data.

Limitations:

• objectId, createdAt, updatedAt are readonly and cannot be imported.

TODOs before merging

• [ ] Add tests
• [ ] Add changes to documentation (guides, repository pages, in-code descriptions)

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