Pull request: 5190-clear-cache

Updates #4695.
Updates #5190.

Squashed commit of the following:

commit f4156f54ebd1b0c96318715441da1dc54cbbfb0f
Author: Ildar Kamalov <ik@adguard.com>
Date:   Fri Dec 2 16:19:03 2022 +0300

    client: button styles

commit 42cd8ac8ac1abb5c43a42065e2374d11f2d9a62b
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Dec 2 15:39:15 2022 +0300

    all: upd dnsproxy

commit 87b04391afeaed28523448aa12a317300e718b72
Author: Ildar Kamalov <ik@adguard.com>
Date:   Fri Dec 2 15:19:07 2022 +0300

    client: add clear cache button

commit ee99548b3689ce47959d9bddc6a1e866e773dcc3
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Dec 1 18:54:54 2022 +0300

    all: add cache clear

client/src/api/Api.js

@@ -593,6 +593,14 @@ class Api {
         };
         return this.makeRequest(path, method, config);
     }
+
+    // Cache
+    CLEAR_CACHE = { path: 'cache_clear', method: 'POST' };
+
+    clearCache() {
+        const { path, method } = this.CLEAR_CACHE;
+        return this.makeRequest(path, method);
+    }
 }
 
 const apiClient = new Api();