TracerProvider should return no-op tracer when shutdown

[pichlermarc]

Description

According to the spec a TracerProvider should return no-op tracer when shutdown.

Steps to Reproduce

Test for BasicTracerProvider.test.ts

  describe('.getTracer()', () => {
    it('should return no-op tracer when already shutdown', () => {
      const tracerProvider = new BasicTracerProvider();
      tracerProvider.shutdown();
	  
	  // returned tracer should be no-op, not instance of Tracer (from SDK) 
      assert.ok(!(tracerProvider.getTracer('foo') instanceof Tracer));
    });
  });

Additional Details

Spec: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#shutdown Link to getTracer() code: https://github.com/open-telemetry/opentelemetry-js/blob/3db10568be4387ef024aa431ca1addef18c2441e/packages/opentelemetry-sdk-trace-base/src/BasicTracerProvider.ts#L93-L101

[sudhanshu-chauhan]

would like to take this up!

[github-actions[bot]]

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