chore: query graph api (#9125)

CLOSES: FRMW-2704

**What**
Re-structure the Query graph API as well as introduce dynamic typing from schemas on the filters and better handling of relation treatment for fields/filters inference

Co-authored-by: Adrien de Peretti <25098370+adrien2p@users.noreply.github.com>

packages/core/orchestration/src/joiner/helpers.ts

@@ -17,7 +17,7 @@ export function toRemoteJoinerQuery(
 
       const canExpand =
         typeof value === "object" &&
-        !["fields", "__args", "__directives"].includes(key)
+        !["fields", "__fields", "__args", "__directives"].includes(key) // TODO: deprecate "fields"
 
       if (!canExpand) {
         continue
@@ -65,8 +65,8 @@ export function toRemoteJoinerQuery(
         )
       }
 
-      if (value.fields) {
-        reference.fields = value.fields
+      if (value.__fields || value.fields) {
+        reference.fields = value.__fields ?? value.fields
       }
 
       if (isEntryPoint) {