Add tsserverlibrary shim to @typescript/typescript6

Author: jakebailey

.changeset/floppy-garlics-sort.md

@@ -0,0 +1,5 @@
+---
+"@typescript/typescript6": patch
+---
+
+Add tsserverlibrary shim

packages/typescript6/lib/tsserverlibrary.d.ts

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+import ts = require("typescript");
+export = ts;

packages/typescript6/lib/tsserverlibrary.js

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+module.exports = require("typescript");