Previously, GET_FRAMERATE and GET_EXPOSURE returned only cached values.
Now they query the actual hardware state using:
- is_SetFrameRate() with IS_GET_FRAMERATE for framerate
- is_Exposure() with IS_EXPOSURE_CMD_GET_EXPOSURE for exposure
This matches the pattern used for auto-exposure, auto-gain, and gain-boost
properties, ensuring UDP control commands return real-time hardware values
instead of stale cached values. Critical when auto-exposure is enabled as
the hardware adjusts exposure dynamically.
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