Remove non-public API usage from ScannerBaseDelegate

[SethSmucker]

Summary

Remove dependencies on non-public Accumulo APIs in ScannerBaseDelegate.

Non-Public Classes

• org.apache.accumulo.core.clientImpl.ScannerOptions
• org.apache.accumulo.core.dataImpl.thrift.IterInfo

Solution

Track iterator names locally instead of introspecting the delegate via non-public APIs:

• Add systemIteratorNames and userIteratorNames Sets
• Update add/remove methods to maintain the local tracking sets
• Simplify clearScanIterators() to iterate over tracked names
• Remove ScannerOptionsHelper inner class

Files Affected

• core/utils/accumulo-utils/src/main/java/datawave/webservice/common/connection/ScannerBaseDelegate.java

Part of #2443