add "spoiler" for text and image

[Ludo-code]

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Feature request

Which Nextcloud Version are you currently using: 33.0.3
Is your feature request related to a problem? Please describe.
Provide a clear and concise description of the problem. For example: “I'm always frustrated when …”

At this time we are unable for exemple to use ||some text|| to mark as spoiler the text and so marking will permit to hide the text until the one that want to see it just click on it to see it. And for exemple for picture when adding picture have a checkbox to mark the picture as spoiler or not.

For exemple Discord is using something like that.

[Antreesy]

Sounds nice!

But it is not a standard MD- or GFM- syntax that we can simply plug in, so need a custom upstream solution in https://github.com/nextcloud-libraries/nextcloud-vue/blob/main/src/components/NcRichText/NcRichText.vue