Add "allow_unencrypted_doh" option to API/UI

[mazzz1y]

Prerequisites

• [X] I have checked the Wiki and Discussions and found no answer

• [X] I have searched other issues and found no duplicates

• [X] I want to request a feature or enhancement and not ask a question

Description

What problem are you trying to solve?

I want to change allow_unencrypted_doh programmatically/via UI. Not only via configuration file

Proposed solution

Add Allow unencrypted DNS-over-HTTPS option to UI in Settings->Encryption settings