[FEATURE] User access for columns

[pawelrosada]

Describe the solution you'd like

MySQL offer access to specific column. It would be useful to manage this from the formula level.
For example you can do it like:

user:
    frank:
      password: 'somepass'
      host: localhost
      databases:
        - database: foo
          grants: ['select', 'insert']
          table: foobar
             - column: col
               grants: ['update']

[myii]

@pawelrosada Thanks for this feature request.

For anyone looking at this, the current pillar.example section is as follows:

mysql-formula/pillar.example

Lines 108 to 115 in b4f5f79

	user:
	frank:
	password: 'somepass'
	host: localhost
	databases:
	- database: foo
	grants: ['select', 'insert', 'update']
	escape: true