Move JavaCSVTableSource operator from sql-api to the Java platform

[zkaoudi]

There is a Java csv source operator inside the wayang sql api:
JavaCSVTableSource.

We should move it to the wayang-platforms/wayang-java module, specifically here and rename it to JavaCSVFileSource because it is reading from a file and not a table in the database.

[kbeedkar]

Makes sense, the reason to call it JavaCSVTableSource was that it expects the csv file to adhere to a certain format. Specifically, comma separated colname:type header row. This is required to create an appropriate schema to query against.