[🔥AUDIT🔥] [fei4960.audit.2] Export trace API (#595)

🖍 _This is an audit!_ 🖍

## Summary:
This exports the `trace` function and `ITraceSession` type so that the render-gateway has access to them.

Issue: FEI-4960

## Test plan:
Nothing special to test here.

Author: somewhatabstract

Auditors: #typescript, #frontend-infra

Required Reviewers:

Approved By:

Checks: ⌛ Lint, typecheck, and coverage check (ubuntu-latest, 16.x), ✅ Prime node_modules cache for primary configuration (ubuntu-latest, 16.x), ✅ gerald, ⌛ Analyze (javascript), ⏭  dependabot

Pull Request URL: #595

.changeset/small-cows-serve.md

@@ -0,0 +1,5 @@
+---
+"@khanacademy/wonder-stuff-server": patch
+---
+
+Export trace API

packages/wonder-stuff-server/src/index.ts

@@ -1,4 +1,10 @@
-export type {LogLevel, Logger, ServerOptions, RequestWithLog} from "./types";
+export type {
+    LogLevel,
+    Logger,
+    ServerOptions,
+    RequestWithLog,
+    ITraceSession,
+} from "./types";
 export {Runtime} from "./types";
 
 export {Errors} from "./errors";
@@ -8,3 +14,4 @@ export {getAppEngineInfo} from "./get-app-engine-info";
 export {getLogger} from "./get-logger";
 export {getRuntimeMode} from "./get-runtime-mode";
 export {startServer} from "./start-server";
+export {trace} from "./trace";