Add Error handling for file input

[talolard]

Currently we support adding files but there is no error handling. Things to handle

• Restrict file types to JSON CSV and TSV
• Display error message when there is an error parsing the JSON (e.g it is invalid)
• Display an error message when the JSON is not supported (we expect a JSON array of objects)
• Warn about CSV parsing errors from papa parse
• Prevent the app from crashing when there is an error (currently there is no error handling at all)

Relevnt file is https://github.com/LightTag/ylabel/blob/master/src/data/components/input/fileInput.js