Add support in Commons CSV for tracking byte positions during parsing.

Summary of Modifications

Test Data Files: Added new test data files, and updated pom.xml to exclude these files from RAT checks, avoiding unapproved license checks.
CSVParser class:
Constructor Enhancements
a. Added support for an optional parameter -- String encoding--, which specifies the encoding to use for the reader.
CSVRecord class
private long characterByte: start byte position of this record
Add new Constructor: support track byte positions in record class
ExtendedBufferedReader Class:
private long bytesRead: Tracks the number of bytes read so far.
private long bytesReadMark: Stores the marked byte position.
CharsetEncoder encoder: Encoder used to calculate byte size of characters.
getCharBytes(int current): This function calculates character bytes based on UTF-8 encoding. Note: it only supports UTF-8 due to the encoding algorithm used. Full encoding can be supported and we just need more effort on this.
reset() and mark() Methods: Enhanced to prevent consuming characters and bytes unintentionally.

Test result:
mvn


Pass unit tests and other restrictions