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Primarily, this PR adds the ability to upload json files as data sources (in addition to CSV and SQLite files). Both 'normal' json files, and files structured as a list of json objects (one json object per line) are supported.
In addition this PR adds significant robustness to the user uploads feature, in terms of the UI, error handling and logging, and test coverage.
Lastly, there are a few small opportunistic features that were modified or added: