Allow custom transformations of assets (#6593)

* Allow custom transformations of assets

This exposes one query parameter `transforms`, which is a JSON array of
shard transformation operations.

It also updates the asset presets. The UX for this still needs some work

* Rename options to arguments for presets

More explicit

* options -> arguments in setting spec

* Better errors for invalid JSON in asset presets

* Add limit to transforms query parameter

* Use flattened option for extra transforms

* Fix placeholder color of code input

* Allow "simple mode" aliases

* Add documentation

Co-authored-by: rijkvanzanten <rijkvanzanten@me.com>

packages/specs/src/paths/assets/assets.yaml

@@ -16,34 +16,11 @@ get:
       description: The key of the asset size configured in settings.
       schema:
         type: string
-    - name: width
+    - name: transforms
       in: query
-      description: Width of the file in pixels.
-      schema:
-        type: integer
-    - name: height
-      in: query
-      description: Height of the file in pixels.
-      schema:
-        type: integer
-    - name: fit
-      in: query
-      description: Fit of the file
+      description: A JSON array of image transformations
       schema:
         type: string
-        enum: [crop, contain, inside, outside]
-    - name: withoutEnlargement
-      in: query
-      description: No image upscale.
-      schema:
-        type: boolean
-    - name: quality
-      in: query
-      description: Quality of compression.
-      schema:
-        type: integer
-        minimum: 1
-        maximum: 100
     - name: download
       in: query
       description: Download the asset to your computer