Upload `-o` output file to s3

[karikarshivani]

It would be a useful feature to upload the output file to s3 if indicated. One example would be a user executing the following command:

saf convert hdf2csv -i TestProfile.json -o s3://bucket-name/TestProfileConverted.csv --fields "Results Set,Status,ID,Title,Severity"

And then saf-cli automatically executing the following command to upload the local converted file:

aws s3 cp TestProfileConverted.csv s3://bucket-name/TestProfileConverted.csv

[aaronlippold]

General support for s3 upload as an output may be nice