Add metadata about temp nature of the table

[Anish9901]

Fixes #1419

Technical details

Why do we need this metadata in the Table response object and our Table model at all?

• One of the first step from the end-user perspective is to select the table they want the CSV file imported to, we would like to store this info somewhere so that even if the session abruptly ends we know where to pickup. To achieve this we are using the table_to_import_to field in this PR.
• We also want to optionally drop the temp table, from where we've imported the data. To know that a table is a temp we are storing that info in our Django table model.

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[mathemancer]

Okay, I think this looks good, and we've disabled the E2E tests for now. So, I'll set this to merge once the CI pipeline runs.