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/src/CameraDevice.ts

@@ -80,6 +80,14 @@ export interface CameraDeviceFormat {
    * Minimum supported ISO value
    */
   minISO: number
+  /**
+   * The minimum Exposure-Bias value this format supports. When setting the `exposure` to this value, the image is almost completely dark (under-exposed).
+   */
+  minExposure: number
+  /**
+   * The maximum Exposure-Bias value this format supports. When setting the `exposure` to this value, the image is almost completely bright (over-exposed).
+   */
+  maxExposure: number
   /**
    * The video field of view in degrees
    */

package/src/CameraProps.ts

@@ -110,6 +110,19 @@ export interface CameraProps extends ViewProps {
   enableZoomGesture?: boolean
   //#endregion
 
+  //#region Camera Controls
+  /**
+   * Specifies the Exposure bias of the current camera. A lower value means darker images, a higher value means brighter images.
+   *
+   * The Camera will still continue to auto-adjust exposure and focus, but will premultiply the exposure setting with the provided value here.
+   *
+   * This values ranges from {@linkcode CameraDeviceFormat.minExposure format.minExposure} to {@linkcode CameraDeviceFormat.maxExposure format.maxExposure}.
+   *
+   * The value between min- and max supported exposure is considered the default, neutral value.
+   */
+  exposure?: number
+  //#endregion
+
   //#region Format/Preset selection
   /**
    * Selects a given format. By default, the best matching format is chosen. See {@linkcode CameraDeviceFormat}