Enable/disable canvas drag

[bogomya]

Checklist

• [x] The code has been run through pretty yarn run pretty
• [x] The tests pass on CircleCI
• [x] You have referenced the issue(s) or other PR(s) this fixes/relates-to
• [x] The PR Template has been filled out (see below)
• [x] Had a beer/coffee because you are awesome

What?

Adding the ability to fix the canvas

Why?

https://github.com/projectstorm/react-diagrams/issues/570

How?

Add control by adding config to DragCanvasState

Feel good image:

[bogomya]

@dylanvorster please review

[Vakintoshka]

👍

[sarastef]

it is available on the last version(6.2.0)?

[KirbyAbadilla]

It seems that this is not added in v6.2.0, the changes in the DragCanvasState constuctor is not reflected