feat: use context to isolate data between requests and messages

[Litarnus]

This PR adds the context introduced in getsentry/sentry-php#2011.

The context is used to properly isolate data between requests and messages and prevent data leaking between requests when using worker runtimes such as FrankenPHP or RoadRunner.

Because message context isolation breaks current behaviour, a new flag isolate_context_by_message is introduced, which defaults to false to keep current behaviour unchanged. When enabled, it will inherit all data that was set before a message is received.

[deluxetom]

I would love to have this merged. I use FrankenPHP and have an issue this PR would fix.

[giortzisg]

LGTM

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

There are 2 total unresolved issues (including 1 from previous review).

Bugbot Autofix prepared a fix for the issue found in the latest run.

• ✅ Fixed: Contradictory assertions in ignored transaction tracing test
  • Updated the ignored-transaction assertion to count only non-transaction events so tracing events no longer conflict with the expected tracing event count.

Or push these changes by commenting:

@cursor push ad868baab6

Preview (ad868baab6)

diff --git a/tests/End2End/TracingEnd2EndTest.php b/tests/End2End/TracingEnd2EndTest.php
--- a/tests/End2End/TracingEnd2EndTest.php
+++ b/tests/End2End/TracingEnd2EndTest.php
@@ -72,7 +72,11 @@
 
     private function assertLastEventIdIsNull(KernelBrowser $client): void
     {
-        $this->assertCount(0, StubTransport::$events, 'Some error was captured');
+        $errorEvents = array_filter(StubTransport::$events, static function (\Sentry\Event $event): bool {
+            return null === $event->getTransaction();
+        });
+
+        $this->assertCount(0, $errorEvents, 'Some error was captured');
     }
 
     private function assertTracingEventCount(int $expectedCount): void

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