getBlob implementation

### Use case
Download binary files from CH

### Describe the solution you'd like
Implement
1. Class - ResultSetImpl
Method - getBinaryStream(String columnLabel)

2. Class - ResultSetImpl
Method - getBlob(String columnLabel)

### Describe the alternatives you've considered
QuerySettings querySettings = new QuerySettings();
querySettings.setFormat(ClickHouseFormat.RawBLOB);
QueryResponse queryResponse = connection.unwrap(ConnectionImpl.class)
.getClient()
.query("select ...", querySettings)
.get();

### Additional context

Locate the ResultSetImpl implementation and inspect the existing getBinaryStream(String columnLabel) and getBlob(String columnLabel) methods or their stubs. Review the RawBLOB QuerySettings example and related ResultSet behavior to understand the expected binary representation. Done means both methods can download binary files from ClickHouse through the JDBC interface, with appropriate coverage in the existing test structure if available.

Written by the indexing model from the issue text.