Add support for CSV and TSV data formats.
Will be implemented by storing the columns (as keywords in a vector) in the metadata. The index name will be based on the selected key.
Since `(get data…
Right now (`v0.8.0`) `lazy-docs` simply use the document IDs from the database index, to create a lazy seq of documents. This works out fine. But the drawback is, that the initial index has to be in m…