feat(apple): Add enableTracingWhenCrashing (#11732)

Add docs for the new option enableTracingWhenCrashing.

Author: philipphofmann

docs/platforms/apple/common/configuration/options.mdx

@@ -271,3 +271,16 @@ String entries do not have to be full matches, meaning the URL of a request is m
 If <PlatformIdentifier name="trace-propagation-targets" /> is not provided, trace data is attached to every outgoing request from the instrumented client.
 
 </ConfigKey>
+
+<ConfigKey name="enable-persisting-traces-when-crashing">
+
+
+<Note>
+
+This feature is experimental, may have bugs and is new in [sentry-cocoa version 8.41.0](https://github.com/getsentry/sentry-cocoa/blob/main/CHANGELOG.md#8410).
+
+</Note>
+
+When enabled, the SDK finishes the ongoing transaction bound to the scope and links them to the crash event when your app crashes. The SDK skips adding profiles to increase the chance of keeping the transaction. This option defaults to `false`.
+
+</ConfigKey>