Tap-minio-csv

* Add JSON Schema type string to all fields as a final fallback in case we miss a crucial sample [5](https://github.com/singer-io/tap-s3-csv/pull/5)
* Add error handling to fail quickly when no streams are found
* Fixes a bug where we could sample the reskey field for a non-rectangular csv [4](https://github.com/singer-io/tap-s3-csv/pull/4)

* Use the singer-encodings library to share more code
* Renames columns like "_s3_source_bucket" to "_sdc_source_bucket" to better align with standards
* Lowers the sample rate to improve speed for larger files
* Fixes a logging bug with a cached value

* Header keys are no longed scrubbed for non-word characters
* Raise an error when a date_override is set but does not exist in the header