st-pk-checker: Creates a report about primary keys

[gordan-bobic]

Parameters:

• DSN in both formats like other tools
• Multiple tables can specified with a comma separated list --tables t1,t2,t3
• --tables-without-pk: only output the list of tables without PKs
• --tables-near-pk-limit: only output the list of tables where PK is within threshold of the maximum integer size
• --tables-with-composite-pk: only output the list of tables with composite PKs that also have additional indexes

This tool should do the following:

1. Find tables without PKs.
   Output:

Tables without primary keys:
----------------------------
schema1.table1
schema2.table2

2. Tables where PK is close to maximum capacity. Re-use options and default thresholds from st-int-capacity-checker.
   Output:

Tables with integer PK close to size limit:
-------------------------------------------
schema1.table1.column1: 90%
schema2.table2.column2: 91%

3. InnoDB tables with composite primary keys that also have any secondary indexes

InnoDB tables with composite primary keys *that also have secondary indexes*
----------------------------------------------------------------------------
schema1.table1
schema2.table2