feat(core-shared): symbols + barrel for instrumentation subpath

packages/core-shared/src/instrumentation/index.ts

@@ -0,0 +1,15 @@
+export type {
+  ITracer,
+  ISpan,
+  SpanOpts,
+  AttributeValue,
+} from "./tracer.interface";
+export type {
+  ILogger,
+  Breadcrumb,
+  CaptureContext,
+} from "./logger.interface";
+export { NoopTracer } from "./noop-tracer";
+export { NoopLogger } from "./noop-logger";
+export { withSpan } from "./with-span";
+export { INSTRUMENTATION_SYMBOLS } from "./symbols";

packages/core-shared/src/instrumentation/symbols.ts

@@ -0,0 +1,4 @@
+export const INSTRUMENTATION_SYMBOLS = {
+  TRACER: Symbol.for("core-shared.TRACER"),
+  LOGGER: Symbol.for("core-shared.LOGGER"),
+} as const;