refactor(server): decouple generated images from image formats (#8246)

* rename

thumbnail config

update target paths, fix tests

rename to image settings

replace legacy enum

better typing

update sql

update api

remove config option

fix

* update docs

* update other thumbnail configs in migration

* keep legacy enum for now

* fix jumbled job names

* fix jumbled job names in tests

* rename thumbhash job

* rename dto

* fix tests

* preserve order

* remove unused import

* keep old fields in dto, marked deprecated

* update sql

---------

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

docs/docs/install/config-file.md

@@ -114,9 +114,11 @@ The default configuration looks like this:
     "hashVerificationEnabled": true,
     "template": "{{y}}/{{y}}-{{MM}}-{{dd}}/{{filename}}"
   },
-  "thumbnail": {
-    "webpSize": 250,
-    "jpegSize": 1440,
+  "image": {
+    "thumbnailFormat": "webp",
+    "thumbnailSize": 250,
+    "previewFormat": "jpeg",
+    "previewSize": 1440,
     "quality": 80,
     "colorspace": "p3"
   },