Multiple large images

[arjunrajlab]

Adds support for multiple large_images as the raw data. This allows for e.g. gaussian blurring, registration, and other types of pixel-level manipulation.

To test, run

docker build -f ./workers/annotations/gaussian_blur/Dockerfile -t annotations/gaussian_blur:latest ./workers/annotations/gaussian_blur/

Then you will have a new Gaussian Blur worker that can be used to do some processing.

Some future work could be:

1. To create either a subsection of tools or even a whole other panel to select these particular image processing workers.
2. Build a few more abstractions for workers to list and access various large_images more easily.
3. When the dataset refreshes, maintain the zoom level.
4. Watch out for quotas.