Add http and https proxy feature

Added new proxy feature based on http and https proxy agents.
Proxy feature works like notifications, there is many proxy
could be related one proxy entry.

Supported features
- Proxies can activate and disable in bulk
- Proxies auto enabled by default for new monitors
- Proxies could be applied in bulk to current monitors
- Both authenticated and anonymous proxies supported
- Export and import support for proxies

src/components/settings/Proxies.vue

@@ -0,0 +1,47 @@
+<template>
+    <div>
+        <!-- Proxies -->
+        <div class="proxy-list my-4">
+            <p v-if="$root.proxyList.length === 0">
+                {{ $t("Not available, please setup.") }}
+            </p>
+            <p v-else>
+                {{ $t("proxyDescription") }}
+            </p>
+
+            <ul class="list-group mb-3" style="border-radius: 1rem;">
+                <li v-for="(proxy, index) in $root.proxyList" :key="index" class="list-group-item">
+                    {{ proxy.host }}<span v-if="proxy.default === true" class="badge bg-primary ms-2">{{ $t("Default") }}</span><br>
+                    <a href="#" @click="$refs.proxyDialog.show(proxy.id)">{{ $t("Edit") }}</a>
+                </li>
+            </ul>
+
+            <button class="btn btn-primary me-2" type="button" @click="$refs.proxyDialog.show()">
+                {{ $t("Setup Proxy") }}
+            </button>
+        </div>
+
+        <ProxyDialog ref="proxyDialog" />
+    </div>
+</template>
+
+<script>
+import ProxyDialog from "../../components/ProxyDialog.vue";
+
+export default {
+    components: {
+        ProxyDialog
+    },
+};
+</script>
+
+<style lang="scss" scoped>
+@import "../../assets/vars.scss";
+
+.dark {
+    .list-group-item {
+        background-color: $dark-bg2;
+        color: $dark-font-color;
+    }
+}
+</style>