key_vector_debug: key vector debug parameters

Usage
-------
key_vector_debug
   validate        < disable | enable >,
   no_rowsource_passthrough < disable | enable >,
   array_init_length <ub4>,
   hash_storage    < default | buf | longbuf >,
   max_reconstituted_parts <ub4>,
   hpk_filter      < enable | disable | debug >,
   pcode_filter    < all | dict | sep | none >,
   use_num         < default | force | none >,
   timestamp_resolution < date | hour | minute | second | solosec >,
   force_lookup_refresh < enable | disable >,
   imca_dgk_hpk    < enable | disable | nibonly >