Adjusted oembed endpoints to fetch higher resolution thumbnails

no issue

- embed cards now store metadata including thumbnail urls in their payload
- we want to use this metadata to render video cards in emails
- by default oembed endpoints return fairly small thumbnail images that don't look great when blown up
- oembed supports a `maxwidth` query param that will instruct oembed providers to return larger sizes of the content if available

core/server/api/canary/oembed.js

@@ -83,7 +83,7 @@ function unknownProvider(url) {
 }
 
 function knownProvider(url) {
-    return extract(url).catch((err) => {
+    return extract(url, {maxwidth: 1280}).catch((err) => {
         return Promise.reject(new common.errors.InternalServerError({
             message: err.message
         }));

core/server/api/v2/oembed.js

@@ -37,7 +37,7 @@ function unknownProvider(url) {
 }
 
 function knownProvider(url) {
-    return extract(url).catch((err) => {
+    return extract(url, {maxwith: 1280}).catch((err) => {
         return Promise.reject(new common.errors.InternalServerError({
             message: err.message
         }));