unsafe-loop[iterator] Rule request: Require all loops have a loop variable

[cidrblock]

This is ok:

  loop:
    - red
    - green
    - blue
  loop_control:
    loop_var: rgb_color

This is not, no loop_var

  loop:
    - a
    - b
    - c

[cidrblock]

disallow the default "item" var from propagating outside a single task, even if the initial implementation was just for "import" tasks this would be a good start