Introduce config to allow for password complexity

[kykyi]

In relation to #5591

This PR introduces application config to allow for password complexity to granularly managed with new validation options for:

• presence of a lower case letter
• presence of a upper case letter
• presence of a number
• presence of a special character (from a list of special characters that is configurable)

These are all false by default, and configurable like:

Devise.setup do |config|
      config.password_length = 8..128 # (existing)
      config.password_requires_lowercase = true
      config.password_requires_uppercase = true
      config.password_requires_number = true
      config.password_requires_special_character = true
      config.password_special_characters = ":)"
end

Note

• I haven't run any linting, I couldn't find instructions on what config was used for that 😄
• I haven't updated any docs, please advise where I need to update if at all 🙏