feat(web): add keyboard shortcut to stack selected photos

[Funk66]

This is my attempt at implementing #5143
I should say that I have zero experience with Svelte. I would be nice to reduce the duplication with

immich/web/src/lib/components/photos-page/actions/stack-action.svelte

Line 15 in 3edc87f

const handleStack = async () => {

but I'm not familiar with the import hierarchy and event propagation conventions, so I would appreciate some guidance here.
As a side note, it may seem confusing to some that the help dialog shows action shortcuts that only work in the asset-viewer page, and now this new one that only works in the asset-grid page. Perhaps these should be shown under different categories.

[ThomasConrad]

When can this get merged?

[martabal]

The logic to stack assets already exist in https://github.com/immich-app/immich/blob/main/web/src/lib/components/photos-page/actions/stack-action.svelte.

Can you use the same logic for the menu option and the shortcut action ?

[Funk66]

I tried deduplicating the code, but I don't know if my changes follow best practices.

[flightmansam]

This would be so handy! How close is a merge?

[isaacolsen94]

Any chance this can get merged? It would be crazy helpful!!

[jrasm91]

@Funk66 can you resolve the merge conflicts and then we can look at merging it.

[isaacolsen94]

Thank you so much @Funk66, @jrasm91 is this good to go now? Sorry to pester! Just could really use this 😛

[jrasm91]

LGTM