Explore moving `Scanner.setBatchSize()` to `ScannerBase`

**Is your feature request related to a problem? Please describe.**
BatchScanner has very few options for controlling the amount of data retrieved. Propose moving setBatchSize to ScannerBase to allow for this configuration option to be applied to BatchScanners as well as scanners.

**Describe the solution you'd like**
Move `Scanner.setBatchSize()` to `ScannerBase`

**Additional context**
This ticket is based off of Jira ticket [ACCUMULO-2001](https://issues.apache.org/jira/browse/ACCUMULO-2001). It was also mentioned on the ticket:

> Before moving to a common base class, the naming of this method should be reconsidered... as the "Batch" in "BatchScanner" (requests are batched, according to the hosting tserver) means something completely different than the "Batch" in "setBatchSize" (results are fetched in batches).

Start by reading the Scanner.setBatchSize() API and the ScannerBase and BatchScanner abstractions mentioned in the issue. Trace how scanner configuration is represented and review the naming concern before deciding on the common API; done means the option is available to both scanner types with agreed terminology and relevant API behavior verified.

Written by the indexing model from the issue text.