Issue #12 - Added scanner support

- Create a scanner
 - Filter support: `ColumnPrefixFilter`, `ColumnRangeFilter`,
   `FamilyFilter`, `QualifierFilter`, `RowFilter`, `FirstKeyOnlyFilter`,
   `InclusiveStopFilter`, `MultipleColumnPrefixFilter`, `PageFilter`,
   `PrefixFilter`, `SingleColumnValueFilter`, `TimestampsFilter`,
   `FilterList`
- Read a result from a scanner
 - Manual
 - Via disposable/enumerable object
- Delete a scanner
 - Manual
 - Via disposable/enumerable object