IMSZ-563 add origin-auth to images fetch (#288)

When fetching images for authenticated origins users may use
an option called 'origin-auth' as part of the fetch api.
Previously, the option was not present in the types eventhough
it was supported by the api. This PR adds the option to the
interface.

Author: florianmartens

.changeset/fluffy-wasps-appear.md

@@ -0,0 +1,5 @@
+---
+"@cloudflare/workers-types": patch
+---
+
+Add 'origin-auth' to RequestInitCfPropertiesImage interface. This changes fixes types for users attempting to fetch images from authenticated sources. Before this fix, users had to manually extend the fetch interface to satisfy the TS compiler.

overrides/cf.d.ts

@@ -272,6 +272,12 @@ interface RequestInitCfPropertiesImage extends BasicImageTransformations {
    * entry is the topmost layer).
    */
   draw?: RequestInitCfPropertiesImageDraw[];
+  /**
+   * Fetching image from authenticated origin. Setting this property will
+   * pass authentication headers (Authorization, Cookie, etc.) through to
+   * the origin.
+   */
+  "origin-auth"?: "share-publicly";
 }
 
 interface RequestInitCfPropertiesImageMinify {