feat: Add SR entrypoint to NPM ahead of LP (#714)

Author: metal-messiah

src/loaders/browser-agent.js

@@ -8,6 +8,7 @@ import { Instrument as InstrumentXhr } from '../features/ajax/instrument'
 import { Instrument as InstrumentSessionTrace } from '../features/session_trace/instrument'
 import { Instrument as InstrumentSpa } from '../features/spa/instrument'
 import { Instrument as InstrumentPageAction } from '../features/page_action/instrument'
+import { Instrument as InstrumentSessionReplay } from '../features/session_replay/instrument'
 
 /**
  * An agent class with all feature modules available. Features may be disabled and enabled via runtime configuration.
@@ -25,7 +26,8 @@ export class BrowserAgent extends Agent {
         InstrumentMetrics,
         InstrumentPageAction,
         InstrumentErrors,
-        InstrumentSpa
+        InstrumentSpa,
+        InstrumentSessionReplay
       ],
       loaderType: 'browser-agent'
     })