Add support for specific column statistics to ANALYZE TABLE command

Currently column statistics for table/partitions can be computed in an all-or-nothing fashion by the "ANALYZE TABLE $tableName COMPUTE STATISTICS FOR COLUMNS" command.

We propose to improve granularity and support the request to compute a single kind of statistics, BIT_VECTOR for instance.

The new syntax could be "ANALYZE TABLE $tableName COMPUTE $statsKind STATISTICS FOR COLUMNS".

In the case of BIT_VECTOR this would translate into "ANALYZE TABLE $tableName COMPUTE BIT_VECTOR STATISTICS FOR COLUMNS".

The change would require to extend the parser and the statistics computation logic.