refactor(camera.ts): task queue

[Sec-ant]

Implement a task queue to keep camera start and stop tasks in order and mitigate potential race conditions.

Users will notice some delay when they open and close the camera frequently (e.g. switching cameras quickly, turning on and off the torch quickly, etc.) because each start and stop action is saved in the task queue and dequeues in order, with no abortion.

Abortion can be added if this is a matter of concern.

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[Sec-ant]

One thing I noticed on my phone is that the camera will stop and start twice when I switch the camera in the Torch demo.

It seems the first flash is because of switching and the second flash is because of detecting the torch capability. Should be fixed in the demo, though?

[gruhn]

Ok, those tests are a bit more effort than I expected, but I definitely managed to reproduce the issue you mentioned and also others I think. Let's just merge your approach. Good job :muscle:

[Sec-ant]

One thing I noticed on my phone is that the camera will stop and start twice when I switch the camera in the Torch demo.

Thanks 👻, but any idea on how to fix this 👆?

[gruhn]

ah no :P I you meant that this is also fixed by your PR. I'll try to look into it.

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:tada: This PR is included in version 5.3.9 :tada:

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