Add Changeset

Author: Josh Calder

.changeset/get-ones-session.md

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+---
+'@keystone-6/auth': major
+'@keystone-6/core': major
+---
+
+Allow customisation of `context.session` object through new `config.getSession` function

.changeset/red-beers-march.md

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+---
+'@keystone-6/auth': major
+'@keystone-6/core': major
+---
+
+Moves `statelessSessions` and `storedSessions` functions into the `@keystone-6/auth` package
+