[NFR] Drop foreign keys before column drop

Let's assume that we have in current database some foreign key on location.instrument_id. Lets assume that we are deleting this column. This won't work because there is existing foriegn key.

ERROR: SQLSTATE[HY000]: General error: 1828 Cannot drop c
olumn 'instrument_id': needed in a foreign key constraint 'suzuki_test/location_ibfk_2'

Phalcon migration should check if there is any foreign key like:

select COLUMN_NAME, CONSTRAINT_NAME, REFERENCED_COLUMN_NAME, REFERENCED_TABLE_NAME
from information_schema.KEY_COLUMN_USAGE
where TABLE_NAME = :currentTable: AND COLUMN_NAME = :currentColumn: AND REFERENCED_COLUMN_NAME IS NOT NULL;

Then on result from it it should delete all constraint with CONSTRAINT_NAME.