Collect all indexes from all tables

[debeando]

When apply indexes starting from slave, and for another reason have inconsistent index in all slaves, with this feature you can find the difference and them fixed.

The idea is to collect all indexes from all tables to detect with another tool the difference between servers, maybe in the future is possible for columns.

+-------+------------+--------------------+--------------+----------------+...+-------------+...+
| Table | Non_unique | Key_name           | Seq_in_index | Column_name    |...| Cardinality |...|
+-------+------------+--------------------+--------------+----------------+...+-------------+...+
| demo  |          0 | PRIMARY            |            1 | id             |...|      368135 |...|
| demo  |          1 | idx_audit_at       |            1 | created_at     |...|          17 |...|
| demo  |          1 | idx_audit_at       |            2 | deleted_at     |...|       12694 |...|
| demo  |          1 | idx_publication_id |            1 | publication_id |...|       61355 |...|
+-------+------------+--------------------+--------------+----------------+...+-------------+...+

output example:

mysql_indexes{"schema": "test", "table"="demo", "index": "idx_audit_at", "column": "deleted_at"} = 12694