Copy lens correction metadata into merged HDR files

[bucaneer]

Is your feature request related to a problem? Please describe.
I'm using a DJI Mini 3 which outputs raw DNG files with lens correction metadata in them, which is recognized and used by the "Lens correction" module in darktable (as of #12880). However, when a set of exposure-bracketed images is merged via "Create HDR", that part of the metadata is lost and lens correction does not work on the resulting HDR image.

Describe the solution you'd like
Lens correction metadata should be copied over into HDR merged images, like other EXIF tags are currently copied over.

Alternatives
In my specific case, I've found that manually applying the TCA & vignetting corrections from the Huawei P30 Pro entry in the lens database works just as well as the embedded metadata. I understand there are also external preprocessors that can apply lens corrections to individual shots before merging, but I haven't tried that.

Additional context
A sample set of 3 bracketed shots with lens correction metadata:
https://www.dropbox.com/s/6kmzy3ntkejrogp/sample_aeb_hdr_lens_correction.zip?dl=0

[andersnygaard]

Can confirm that the profile from Huawei 30 Pro is close, but vignetting is more than dark corners and a great deal of color distortion remains a problem.

Adding to your issue, I would like to present raw files from the new DJI Air 3. This drone inherits the Mini 3s 24mm camera but also adds a second camera with 70mm focal length. Dual sensor, but the same type of CMOS sensor. Now what's interesting is that Dartktable is not able to add the embedded lens correction metadata from the 24mm lens, but the ones from the 70mm does work.

Files are uploaded to my Onedrive at https://1drv.ms/f/s!AtaerbceABlrie5qp45Iwrg9JNABRQ?e=EPWHsF

[TurboGit]

Rescheduled for 4.8.