chore: export shimmer functions

Author: Joozty

experimental/packages/opentelemetry-instrumentation/src/index.ts

@@ -33,3 +33,4 @@ export {
   safeExecuteInTheMiddleAsync,
 } from './utils';
 export { SemconvStability, semconvStabilityFromStr } from './semconvStability';
+export * from './shimmer'