Customize Password Requirements

*This issue was originally created by [**@Tsangares**](https://github.com/Tsangares) at .*

Currently I do not see any password configuration parameters for new users registering to the dendrite server. On the synapse server there was options on the strength. Ultimately, I think if its a strong 8 character password I think that's enough.

I am trying to onboard friends and family to use matrix over signal or whatsapp when possible and having a crazy intense password will limit the ability for onboarding new users.

The feature could be simple, in the yaml config just parametrize each of the password requirements and allow boolean toggles on and off and a int field for the minimum password length.