Pass EXIF data to the wp_read_image_metadata filter

[desrosj]

Currently, if a function hooking into wp_read_image_metadata wants to use the image's EXIF data to change the attachment meta, it needs to check and reprocess the EXIF data using exif_read_data().

The processed EXIF data should just be made available through the filter hook.

[SergeyBiryukov]

In 42878:

Media: In wp_read_image_metadata(), rename $sourceImageType variable to $image_type to match coding standards.

See #43624.

[SergeyBiryukov]

In 42879:

Media: Pass EXIF data to the wp_read_image_metadata filter.

Props desrosj.
Fixes #43624.

[johnbillion]

Let's merge [42878] and [42879] into 5.0.

[pento]

👍🏻

[SergeyBiryukov]

In 43749:

Media: In wp_read_image_metadata(), rename $sourceImageType variable to $image_type to match coding standards.

Merges [42878] to the 5.0 branch.
See #43624.

[SergeyBiryukov]

In 43750:

Media: Pass EXIF data to the wp_read_image_metadata filter.

Props desrosj.
Merges [42879] to the 5.0 branch.
Fixes #43624.