Lock region/rectangle's position to label them without risk of moving

**Is your feature request related to a problem? Please describe.**
For a project I have loaded OCR data into Label Studio with Regions already placed on the texts. The goal is to be able to label these regions without moving the regions themselves. This is important as for my project the labeled data is going to be fed back to my own data store.

**Describe the solution you'd like**
A way to toggle a positional lock on a region upon import and during labeling. But still being able to change the label on this region.

**Describe alternatives you've considered**
There was another issue to lock only a label. #1550 Maybe this can have multiple checkmarks to lock labels and regions as needed.

Json example:
` {
"id": "1",
"original_width": 1240,
"original_height": 1754,
"image_rotation": 0,
"text": "Total",
"value": {
"x": 5,
"y": 10,
"width": 6,
"height": 6,
"rotation": 0,
"labels": [],
"location_locked": "true",
"label_locked": "false"
},
"from_name": "myLabel",
"to_name": "myImage",
"type": "labels"
},`