Test/Check domain against Filter rules

[ghost]

It would be a neat idea to have a user-friendly option for them to test their filter setup, similar to how you are able to check for DHCP, or Test Upstream DNS Servers.

The user could type a particular URL or Domain into a text field and click 'Check' for AdGuard Home to tell them if AdGuard Home is currently blocking it, unblocking it, or passing through.

eg. user types google.com, or pastes a long URL from google.com into text field, clicks 'Check' button

• Output if blocked: red notification: "google.com is currently blocked in your filters."
• Output if no entry in filter: grey notification: "google.com does not exist in any filter."
• Output if unblocked: green notification: "google.com is currently unblocked in your filters."

[Yuan573]

We can use a block page like AdGuard DNS, redirect blocked domain to 176.103.130.133.
If AdGuard Home server uses port 80/443, maybe can try to redirect to AdGuard Home and display related information.

[ghost]

Same request here to implement within v0.101 #1003 and +1 vote for @planet0 UI suggestion