feat: Add a gallery of all the images present on the server (v2)

[VaiTon]

What

• Image list gallery v2

Supersedes

• feat: image list gallery #2724

2022-09-02.23-57-37.mp4

[teolemon]

@VaiTon in the next PR, we could add image flagging: https://github.com/openfoodfacts/hunger-games/pull/172/files

[VaiTon]

@monsieurtanuki I've fixed the file names problem with the url hash. Please tell me your opinion

[monsieurtanuki]

@monsieurtanuki I've fixed the file names problem with the url hash. Please tell me your opinion

@VaiTon That's better, but a hash is not unique. My suggestion is.

[VaiTon]

@monsieurtanuki The hash should be unique. If the URL is the same there is no need to check if we're overwriting the image. Also we're not storing anything on the DB that we'd need to clean when we're done

[monsieurtanuki]

[VaiTon]

@monsieurtanuki I don't really find it something we should care about, as the probability of getting a collision should be really low, decreased by the fact that we should be dealing with different URLs each time.

Despite that, just to make sure that there is no such case, I'm implementing the progressive number check.

Now a question is: when do we need to reset the number to 0 ? Never? Every X days?

[monsieurtanuki]

@VaiTon Good, it's safer this way. And make sure that we can reuse your getNextSequenceNumber method; I'll use it in #2872 (depending on which code is merged first).
The limit as int seems to be 2^53-1, which is a lot, so we are safe here, no need to cycle.
The space taken by the files will be taken care for by the system as we're talking about files in a "temporary folder".

[monsieurtanuki]

Thank you @VaiTon for those exchanges!
LGTM
Still not convinced by the RRect around the images, but we'll see later, let's merge now!

[VaiTon]

Thank you @monsieurtanuki for your reviews ! 🚀 🎉