feat: Password-protected AES-256 encrypted pastes

[jackdorland]

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• I understand.

Is your feature request related to a problem? Please describe.

N/A

Describe the solution you'd like

When pastes are uploaded, perhaps through a /encrypt endpoint, you would need to specify a password in the query parameters (or multipart form value). The server would then hash the password, salt it, encrypt the paste, and return the ID. No other data will be stored on the server other than the hash of the password.

Describe alternatives you've considered

N/A

Additional context

• First referred to in Implement read and create document endpoints. #24.

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