* Add Tabula dependency and exclude slf4j-simple
- Add tabula-java dependency to extract tables into CSV.
- Exclude slf4j-simple due to Logback
* Add a flexible CSVWriter
- Add FlexibleCSVWriter which extends CSVWriter to pass a custom CSVFormat, as CSVWriter's parameterized constructor (that allows changing CSVFormat) is protected.
* Use Tabula in extracting tables from PDF
- Use Tabula in extracting tables from PDF instead of the existing implementation
* Delete PDFTableStripper as It is unneeded
- Delete PDFTableStripper as It is unneeded as Tabula-Java is used instead.
* Use correct class in ExtractCSVController logger
* Exclude gson and bcprov-jdk15on dependencies from tabula
- Exclude gson and bcprov-jdk15on from tabula-java due to detected security vulnerabilities.
