feat(cli): support protected files

[tessus]

This PR supports the upload of protected files.

$ rpaste -a atoken -s https://test.local/paste -p -P README.md
README.md => https://atvie01v.local/paste/README.Y1xh.md (Password: CZvMZl78LMoNrR4jQvz7dXu2)

$ rpaste -a atoken -s https://test.local/paste -P README.md
https://atvie01v.local/paste/README.P12a.md (Password: vdZihhnVIPWMZnw9WFRfp2D1)

[mergify]

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