Feat: Show progress of docker pull

[apoorvsadana]

docker.modem.followProgress has an onProgress event listener. We can use that to detect the progress of the Docker installation and show it to the user. Currently, we just show a simple infinite loader.

The progress event fired by Dockerode isn't a simple event with progress percentage, instead it contains the actual logs you see during docker pull. So we need to come up with a neat way to show the progress to the user. Some ideas

• Calculate the total progress % using some formula
• Show a dialog box which shows the logs as it is from the user