feat(dns): Refactor DNS setup to use dnsproxy instead of unbound

This patch refactors the existing setup to use dnsproxy instead of
unbound for base DNS. This should improve performance and provide better
DNS resolution, since previously there were a lot of failed lookups,
which work with the online resolver.

References:
https://github.com/AdguardTeam/dnsproxy

apps/k8s01/dns/dns.yaml

@@ -16,27 +16,14 @@ spec:
         app: resolver
     spec:
       containers:
-        - name: dns-over-httpd
-          image: quay.io/sheogorath/doh:latest
-          env:
-            - name: UPSTREAM_NAME
-              value: localhost4
-          ports:
-            - containerPort: 8053
-          resources:
-            requests:
-              cpu: 100m
-              memory: 256Mi
-            limits:
-              cpu: 100m
-              memory: 256Mi
-        - name: named
-          image: docker.io/secns/unbound:latest
-          env:
-            - name: CACHE_MIN_TTL
-              value: "1200"
-            - name: PREFETCH
-              value: "yes"
+        - name: dnsproxy
+          image: quay.io/sheogorath/dnsproxy:0.42.0
+          args:
+            - --upstream=https://dns.shivering-isles.com/dns-query
+            - --bootstrap=1.1.1.1
+            - --listen 0.0.0.0
+            - --cache-min-ttl=300
+            - --cache-optimistic
           ports:
             - containerPort: 53
               protocol: TCP
@@ -49,27 +36,6 @@ spec:
             limits:
               cpu: 100m
               memory: 256Mi
-          volumeMounts:
-            - name: unbound-chroot
-              mountPath: /usr/local/etc/unbound/conf.d/
-              readOnly: true
-        # - name: unbound-exporter
-        #   image: ghcr.io/leoquote/unbound_exporter:main
-        #   ports:
-        #     - name: metrics
-        #       containerPort: 9167
-        #       protocol: TCP
-        #   resources:
-        #     requests:
-        #       cpu: 100m
-        #       memory: 64Mi
-        #     limits:
-        #       cpu: 100m
-        #       memory: 64Mi
-      volumes:
-        - name: unbound-chroot
-          configMap:
-            name: unbound-chroot
       automountServiceAccountToken: false
 ---
 apiVersion: v1
@@ -104,31 +70,6 @@ spec:
       port: 53
       targetPort: 53
 ---
-apiVersion: v1
-kind: Service
-metadata:
-  name: dns-over-http
-spec:
-  selector:
-    app: resolver
-  ports:
-    - protocol: TCP
-      port: 80
-      targetPort: 8053
----
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: unbound-chroot
-data:
-  chroot.conf: |
-    server:
-      chroot: ""
-      statistics-interval: 60
-      extended-statistics: yes
-    remote-control:
-      control-enable: yes
----
 apiVersion: policy/v1
 kind: PodDisruptionBudget
 metadata: