feat(apple): Flag for UIViewControllerTracking (#4859)

Author: philipphofmann

src/platforms/apple/common/performance/instrumentation/automatic-instrumentation.mdx

@@ -20,6 +20,26 @@ The SDK creates spans to provide insight into the time consumed by each of the m
 
 ![UIViewController Transaction](ui-view-controller-transaction.png)
 
+To disable the UIViewController Instrumentation:
+
+```swift {tabTitle:Swift}
+import Sentry
+
+SentrySDK.start { options in
+    options.dsn = "___PUBLIC_DSN___"
+    options.enableUIViewControllerTracking = false
+}
+```
+
+```objc {tabTitle:Objective-C}
+@import Sentry;
+
+[SentrySDK startWithConfigureOptions:^(SentryOptions *options) {
+    options.dsn = @"___PUBLIC_DSN___";
+    options.enableUIViewControllerTracking = NO;
+}];
+```
+
 ## App Start Instrumentation
 
 This feature is available for iOS, tvOS, and Mac Catalyst.