multipass find should output image_hash

**What are you trying to do?**
In order to compare exactly a running image with an image release from the output of `multipass find`, comparing the `image_hash` of both is the only way to do it exactly.

**What's your proposed solution?**
Luckily, the information is already in the `multipassd-image-records.json` file. Outputting it in `multipass find` the same way that `multipass info example` does would be great.

**Additional context**
I'm making a Terraform plugin provider for multipass, and this feature would enable me to compare desired state vs current state exactly.

Start with the `multipass find` output path and compare it with the existing `multipass info example` output, using `multipassd-image-records.json` as the named data source. Done means `multipass find` exposes each image's `image_hash` so it can be compared exactly with the corresponding image information.

Written by the indexing model from the issue text.