fix(camera): add safe guard for IOS devices without flash

[JPilson]

While testing the new Multi Camera support, I noticed that it works flawlessly on Android and iPhone devices. However, when testing on iPad Air 5th Generation and iPad Air M1 (5th Generation), the app would consistently crash.

After investigating, I found that these iPad models do not include hardware flash support, and the current implementation assumes that flash is always available. This causes a crash when the flash UI is initialized.
XCODE - ERROR

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[AVCapturePhotoOutput capturePhotoWithSettings:delegate:] flashMode must be set to a value present in the supportedFlashModes array'

This happens due to flashmode being set on device that does not have flash , similar problem has been caught in Flutter Camera Plugin.

check:

• AVCam Project Crashes On iPad

• [AVCapturePhotoOutput capturePhotoWithSettings:delegate:] flashMode must be set to a value present in the supportedFlashModes array

What this PR does

• Adds a safe guard check before initializing flash-related UI elements.
• Ensures that flashButton and related functionality are only enabled if the device actually supports flash.
• Prevents crashes on iPads and improves stability across devices without flash hardware.

Why it’s important

This fix is not only relevant to my own use case, but also to any developers who have users working on iPads (or other devices without flash). By adding this safeguard, we ensure that the Multi Camera feature is more robust and usable across the full range of supported devices.

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[shiv19]

@JPilson Thanks for testing this on iPads. That was the only device I couldn't test this one as I can't test the Camera on the iPad simulator.
I'll merge your PR now. I really appreciate you taking the time to try out my branch.