Add graceful handling for the rest of the file types

[aybeshlikyan]

Need to handle file-fasta, file-bed, and file-py inputs gracefully. Those are appropriate command line arguments but the program currently exists with 'KeyError' because those cases don't exist in the file_type_swicher:
https://github.com/uclahs-cds/public-tool-PipeVal/blob/ed63a65d90e3a20c630c34fe7857b8d0668fa023/validate/__main__.py#L104-L111