feat: Implement exposure (#2173)

* feat: Implement `exposure` (iOS)

* Update Podfile.lock

* Format

* Expose exposure in format

* Set exposure in Camera2

* fix: Fix exposure calculation

* Add exposure docs

package/ios/Core/CameraSession+Configuration.swift

@@ -285,6 +285,20 @@ extension CameraSession {
     device.videoZoomFactor = clamped
   }
 
+  // pragma MARK: Exposure
+
+  /**
+   Configures exposure (`exposure`) as a bias that adjusts exposureTime and ISO.
+   */
+  func configureExposure(configuration: CameraConfiguration, device: AVCaptureDevice) {
+    guard let exposure = configuration.exposure else {
+      return
+    }
+
+    let clamped = max(min(exposure, device.maxExposureTargetBias), device.minExposureTargetBias)
+    device.setExposureTargetBias(clamped)
+  }
+
   // pragma MARK: Audio
 
   /**