Add Effect-native core event system (#27415)

packages/core/src/session.ts

@@ -0,0 +1,13 @@
+export * as Session from "./session"
+
+import { Schema } from "effect"
+import { withStatics } from "./schema"
+import { Identifier } from "./util/identifier"
+
+export const ID = Schema.String.check(Schema.isStartsWith("ses")).pipe(
+  Schema.brand("SessionID"),
+  withStatics((schema) => ({
+    descending: (id?: string) => schema.make(id ?? "ses_" + Identifier.descending()),
+  })),
+)
+export type ID = typeof ID.Type