fix(opentelemetry-core): adding web worker and ssr support

Author: ryhinchey

packages/opentelemetry-core/src/platform/browser/environment.ts

@@ -25,7 +25,9 @@ import {
  * Gets the environment variables
  */
 export function getEnv(): Required<ENVIRONMENT> {
-  const _window = window as typeof window & RAW_ENVIRONMENT;
+  const _window = (typeof window === 'undefined'
+    ? self
+    : window) as typeof window & RAW_ENVIRONMENT;
   const globalEnv = parseEnvironment(_window);
   return Object.assign({}, DEFAULT_ENVIRONMENT, globalEnv);
 }