feat: photo viewer modal

[chrismclarke]

Is your feature request related to a problem? Please describe.
Following #292 there is now a photo-list component that displays a grid of all photos a user has taken. These photos are 120px x 120px to allow for reasonable list display, however are too small to see detail. It would be good if photos could be opened in a larger viewer on tap

Describe the solution you'd like
Add a dialog/modal template that can display the photo in larger format. This should automatically be opened on tap, and include a button to dismiss (and possibly also move the photo delete button to the modal).

Alternatives considered
There are existing packages (e.g. https://www.npmjs.com/package/viewerjs) to handle photo viewing, however these might be a bit overkill for our requirements

Additional context
It might be easiest to write the modal template within the same photo-view component. You can use mat dialog to launch a dialog using local html ng-template, see example in apps\picsa-apps\dashboard\src\app\modules\crop-information\pages\variety-details\variety-details.component.html