refactor: separating the nested module code

Author: joker23

…platform/fetchBrowserEventSource.test.ts …ntsource/fetchBrowserEventSource.test.tspackages/sdk/browser/__tests__/platform/fetchBrowserEventSource.test.ts renamed to packages/sdk/browser/__tests__/fetch-eventsource/fetchBrowserEventSource.test.ts packages/sdk/browser/__tests__/platform/fetchBrowserEventSource.test.ts renamed to packages/sdk/browser/__tests__/fetch-eventsource/fetchBrowserEventSource.test.ts

@@ -1,7 +1,7 @@
 import { createEventSource as mockedCreateEventSource } from '@launchdarkly/eventsource';
 import { EventSourceInitDict } from '@launchdarkly/js-client-sdk-common';
 
-import fetchBrowserEventSource from '../../src/platform/fetchBrowserEventSource';
+import fetchBrowserEventSource from '../../src/fetch-eventsource/fetchBrowserEventSource';
 
 // The fetch-based EventSource needs a streaming fetch, which jsdom does not provide. Only the
 // adapter is under test here; the implementation itself is covered by the eventsource package's

…/src/platform/fetchBrowserEventSource.ts …h-eventsource/fetchBrowserEventSource.tspackages/sdk/browser/src/platform/fetchBrowserEventSource.ts renamed to packages/sdk/browser/src/fetch-eventsource/fetchBrowserEventSource.ts packages/sdk/browser/src/platform/fetchBrowserEventSource.ts renamed to packages/sdk/browser/src/fetch-eventsource/fetchBrowserEventSource.ts

@@ -10,5 +10,5 @@
  *
  * @packageDocumentation
  */
-export { default as fetchBrowserEventSource } from './platform/fetchBrowserEventSource';
+export { default as fetchBrowserEventSource } from './fetchBrowserEventSource';
 export type { LDEventSourceFactory } from '@launchdarkly/js-client-sdk-common';

…ges/sdk/browser/src/fetch-eventsource.ts …k/browser/src/fetch-eventsource/index.tspackages/sdk/browser/src/fetch-eventsource.ts renamed to packages/sdk/browser/src/fetch-eventsource/index.ts packages/sdk/browser/src/fetch-eventsource.ts renamed to packages/sdk/browser/src/fetch-eventsource/index.ts

@@ -5,7 +5,7 @@ import { defineConfig } from 'tsup';
 export default defineConfig({
   entry: {
     index: 'src/index.ts',
-    'fetch-eventsource': 'src/fetch-eventsource.ts',
+    'fetch-eventsource': 'src/fetch-eventsource/index.ts',
   },
   minify: true,
   format: ['esm', 'cjs'],