Some improvements and preparation for GraphQL v16 (#3443)

* Test GraphQL v16

* Fix tests

* Move collectFields to utils

* v16< support

* More

* Fix tests for v14 and v15

* Fix

* Naming

* Use 15 in resolutions

* Go

* ...

* Cleanup

* Do not import an nested modules from graphql-js

* Fix build

* Changesets and more

* Update graphql-js peerDep range

* More

* Fix

* Improve DX

* Some memoization

* Fix memoize functions

* More

* Fix tests

* Reuse functions

* ???

* Less iterations

* Remove object.assign at all

* More

* ...

Author: ardatan

.changeset/config.json

@@ -3,7 +3,7 @@
   "changelog": "@changesets/cli/changelog",
   "commit": false,
   "linked": [],
-  "access": "restricted",
+  "access": "public",
   "baseBranch": "master",
   "updateInternalDependencies": "patch",
   "ignore": [

.changeset/few-chefs-bow.md

@@ -0,0 +1,6 @@
+---
+'@graphql-tools/delegate': minor
+'@graphql-tools/utils': minor
+---
+
+enhance(utils): copy inspect util from graphql-js