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Feature Request: Add support for controlling Auto-Exposure and Manual Exposure #44

Description

@Vibehunterr

Currently, the plugin provides excellent high-level controls for features like Auto Focus, Auto White Balance, Brightness, and Zoom. However, there is no way to control the camera's Exposure Mode (switching between Auto Exposure and Manual Exposure) or to set a specific manual exposure value. This is a critical feature for applications that need to operate in varying or difficult lighting conditions.

I would like to request three new features be added to the plugin's API:
i)A way to toggle Auto-Exposure: A new method in the API, similar to setAutoFocus
ii)A way to read the current Auto-Exposure state: A new property in the object that reports camera features
iii) A way to set the manual exposure value: A new method to set the absolute exposure time when auto-exposure is turned off

I have investigated the plugin's native Android source code and found that the underlying jiangdg/ausbc library (specifically the UVCCamera class) does support this functionality through the setExposureMode(int mode) and getExposureMode() methods.

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