Move Isolate-related exports to sentry_io.dart (#1371)

Co-authored-by: Manoel Aranda Neto <5731772+marandaneto@users.noreply.github.com>

Author: mnordine

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## Unreleased
+
+### Fixes
+
+- Fix Dart web builds breaking due to `dart:io` imports when using `SentryIsolate` or `SentryIsolateExtension` ([#1371](https://github.com/getsentry/sentry-dart/pull/1371))
+  - When using `SentryIsolate` or `SentryIsolateExtension`, import `sentry_io.dart`.
+
 ## 7.4.0
 
 ### Features

dart/lib/sentry.dart

@@ -36,9 +36,6 @@ export 'src/type_check_hint.dart';
 export 'src/exception_cause_extractor.dart';
 export 'src/exception_cause.dart';
 export 'src/exception_stacktrace_extractor.dart';
-// Isolates
-export 'src/sentry_isolate_extension.dart';
-export 'src/sentry_isolate.dart';
 // URL
 // ignore: invalid_export_of_internal_element
 export 'src/utils/http_sanitizer.dart';

dart/lib/sentry_io.dart

@@ -1,3 +1,6 @@
 // ignore: invalid_export_of_internal_element
 export 'sentry.dart';
 export 'src/sentry_attachment/io_sentry_attachment.dart';
+// Isolates
+export 'src/sentry_isolate_extension.dart';
+export 'src/sentry_isolate.dart';