Unsupported ResultSet and DatabaseMetaData methods throw UnsupportedOperationException #114

Many methods throw UnsupportedOperationException. JDBC requires SQLFeatureNotSupportedException for an unsupported optional feature. Callers that catch SQLException crash on the unchecked exception.

Affected methods include:

• In LibsqlResultSet: getBinaryStream, getAsciiStream, getCharacterStream, getBlob, getClob, getURL, getRowId, and the update* methods.
• In LibsqlDatabaseMetaData: getProcedures, getTablePrivileges, getBestRowIdentifier, and similar methods.

sqlite-jdbc supports getBinaryStream and getCharacterStream, and some blob and clob methods. Two smaller defects in the same area:

• getObject(int, Map) and getObject(String, Map) ignore the map. fix(jdbc): reject unsupported type maps and report holdability #95 made Connection.setTypeMap reject type maps.
• findColumn(null) throws a NullPointerException instead of an SQLException.

Expected:

• Throw SQLFeatureNotSupportedException from every unsupported method.
• Implement the stream getters on top of getBytes and getString.
• Make getObject with a map reject a non-empty map.
• Throw an SQLException for a null label.