Add AdGuard, Bazarr, and Coin Market Cap widgets

- Allow setting HTTP method in widget.js
- Allow sending allow listed query params to proxy

src/widgets/coinmarketcap/widget.js

@@ -0,0 +1,15 @@
+import credentialedProxyHandler from "utils/proxies/credentialed";
+
+const widget = {
+  api: "https://pro-api.coinmarketcap.com/{endpoint}",
+  proxyHandler: credentialedProxyHandler,
+
+  mappings: {
+    "v1/cryptocurrency/quotes/latest": {
+      endpoint: "v1/cryptocurrency/quotes/latest",
+      params: ["symbol", "convert"],
+    },
+  },
+};
+
+export default widget;