Added support for ArduCam IMX462

[will-rigby]

I've added support for the Arducam IMX462. Below is an image captured last night with AllSky

[EricClaeys]

@will-rigby, Will, you beat me to it. Would you please do a PR against Point-Release-4 branch? We will merge it into master in a week or so. Other than point releases, we only merge very critical items directly into master. If you know how to change this PR to Point-Release-4, please do so AND LET ME KNOW HOW PLEASE. My Git skills aren't very good.

For the Red and Blue balance, per the output you provided me the min should be 0 and the max 32:

ColourGains : [0.000000..32.000000]

I'm pretty sure what we call "ExposureCompensation" they call:

ExposureValue : [-8.000000..8.000000]

so those min and max values need to change.

Do you like the max exposure time:

ExposureTime : [14..0]

I've notified the libcamera team but am not sure they'll ever fix it. If you could add a new Issue about the incorrect ExposureTime for this camera that would be great!

For the default values, I believe if you run

libcamera --metadata /tmp/metadata --shutter 1 --nopreview --output /tmp/junk.jpg

and then look in /tmp/metadata it will tell you the values it used, which except for ExposureTime will be the defaults.

[will-rigby]

@EricClaeys Hey Eric, I thought I'd have a crack at it, I've updated those values. I'm able to change branch by clicking the edit button on the top of this pull request page. I've set it to the one you've requested.

[EricClaeys]

Thanks for the updates, Will.
And for instructions for how to change branch. I spent a half hour one day pushing every link I saw trying to change the branch, but obviously missed one!