WhereCqlClauseAnalyzer.isIndexOnColumn has incorrect index test

[amorton]

code is

  private boolean isIndexOnColumn(CqlIdentifier column) {
    // NOTE: does not check the type of the secondary index, assuming all is SAI
    // have to use list because the indexes are keyed on the index name, not the column name.
    // TODO: confirm it is OK to not check the index type and properties
    return tableMetadata.getIndexes().values().stream()
        .anyMatch(index -> index.getTarget().equals(column.asInternal()));
  }

But the target on the indexMetadata is not just the column name, this was written before the API had it's own schema objects which we should use via the ApiTableDef.