split into build_csv_reader, from_csv_reader
add escape, quote, terminator arg to build_csv_reader

schema inference support for non-standard CSV

  add fn infer_file_schema_with_csv_options
  add fn infer_reader_schema_with_csv_options

ReaderBuilder support for non-standard CSV

add escape, quote, terminator field
add fn with_escape, with_quote, with_terminator
change ReaderBuilder::build for non-standard CSV

add #[test] fn test_non_std_quote
add #[test] fn test_non_std_escape
add #[test] fn test_non_std_terminator