Add Mutator API to experimental sub export

.chronus/changes/feature-mutators-2024-7-28-15-59-14.md

@@ -0,0 +1,7 @@
+---
+changeKind: feature
+packages:
+  - "@typespec/compiler"
+---
+
+Adding experimental (unstable) API fro Type Mutators

packages/compiler/package.json

@@ -40,6 +40,10 @@
     "./emitter-framework": {
       "types": "./dist/src/emitter-framework/index.d.ts",
       "default": "./dist/src/emitter-framework/index.js"
+    },
+    "./experimental": {
+      "types": "./dist/src/experimental/index.d.ts",
+      "default": "./dist/src/experimental/index.js"
     }
   },
   "browser": {

packages/compiler/src/experimental/index.ts

@@ -0,0 +1,11 @@
+export * from "./mutators.js";
+export * from "./realm.js";
+
+import { createConsoleSink } from "../core/logger/console-sink.js";
+import { createLogger } from "../core/logger/logger.js";
+
+const logSink = createConsoleSink({ pretty: true });
+const logger = createLogger({ sink: logSink, level: "warning" });
+logger.warn(
+  "Functionality from @typespec/compiler/experimental is highly likely to change or be removed."
+);