feat: add UI ssh key pair generator

[antoine-sh]

Proposition to solve #589 issue by adding ssh key generation buttons on sftp volume & repository creation pages.

• Adds a new ssh utils file with the keypair generation function
• The key is generated in browser and auto-fills the form fill
• Adds a Copy public key button that enables after keypair generation
• Nice little description message and error message if it fails

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[nicotsx]

This code is duplicated exactly across both forms. Make it a re-usable component

[nicotsx]

Copy to clipboard will never work if not on https or localhost. So a user using an ip 192.168.1.10 will never be able to get their public key. Maybe you could render a read-only input for the public key. I prefer to avoid the clipboard api altogether

[nicotsx]

^ Sorry i wrote these comments long ago but forgot to post them