Add the ability to reference elements further up the call chain as na…

…med parameters (#2988)

Query planning and composition work for adding @fromcontext and @context
along with bump federation to version 2.8 to accommodate.

---------

Co-authored-by: o0Ignition0o <jeremy.lempereur@gmail.com>
Co-authored-by: Sachin D. Shinde <sachin@apollographql.com>

.changeset/hungry-llamas-remember.md

@@ -0,0 +1,25 @@
+---
+"@apollo/query-planner": minor
+"@apollo/query-graphs": minor
+"@apollo/composition": minor
+"@apollo/federation-internals": minor
+"@apollo/gateway": minor
+---
+
+Implement new directives to allow getting and setting context. This allows resolvers to reference and access data referenced by entities that exist in the GraphPath that was used to access the field. The following example demonstrates the ability to access the `prop` field within the Child resolver.
+
+```graphql
+type Query {
+  p: Parent!
+}
+type Parent @key(fields: "id") @context(name: "context") {
+  id: ID!
+  child: Child!
+  prop: String!
+}
+type Child @key(fields: "id") {
+  id: ID!
+  b: String!
+  field(a: String @fromContext(field: "$context { prop }")): Int!
+}
+```

.cspell/cspell-dict.txt

@@ -182,6 +182,7 @@ referencer
 relatity
 Remaings
 Remainings
+Renamers
 reoptimized
 repeateable
 reponse