Upload and register flat files into Athena

[DyfanJones]

To be able to upload a flat file saved on users computer and register it in AWS Athena without the requirement of having to upload it first into R.

[DyfanJones]

This method might require a new function outside of the current method to upload files to AWS Athena dbWriteTables.

[DyfanJones]

If this comes into the package then a limited file type will be supported similar to dbWriteTables with the support of (csv, tsv and parquet).

This is down to the requirement of needing to identify the variables and classes so the DDL can be correctly created in AWS Athena.