Issues with exif orientation not being preserved

You may consider using https://www.drupal.org/project/exif_orientation for all uploads across the site. However if you are limiting the max image dimensions on upload it may not work because the resizing takes place before exif_orientation fixes the image. https://www.drupal.org/project/exif_orientation/issues/2344175

This really is a problem with IMCE that can't be solved by using the EXIF Orientation module due to the way that IMCE sets the the file validators. EXIF Orientation works by either:

1. Adding a validator function before the file_validate_image_resolution() validator with a hook_field_widget_form_alter() that will rotate the image.
2. Using a hook_file_presave() to do the rotation as the image is saved.

These won't work with IMCE because (1) IMCE doesn't use form validators and (2) it's too late by the time presave is run because the EXIF data has already been stripped.

This could be fixed in IMCE in ImcePlugin::opUpload() in a couple different ways:

1. We could check if EXIF Orientation is enabled and add its validator function first.

$validators = [];
// If exif_orientation is enabled, use its validator.
if (\Drupal::service('module_handler')->moduleExists('exif_orientation')) {
  $validators['exif_orientation_validate_image_rotation'] = [];
}
// Extension validator.
$exts = $fm->getConf('extensions', '');
$validators['file_validate_extensions'] = [$exts === '*' ? NULL : $exts];

2. More generally, we could add support for hook_imce_file_upload_validators_alter() functions:

// Name validator.
$validators[get_class($this) . '::validateFileName'] = [$fm];
// Allow other modules to alter the validator functions.
\Drupal::moduleHandler()->alter('imce_file_upload_validators', $validators);
// Save files.
if ($files = file_save_upload('imce', $validators, $destination, NULL, $replace)) {

Then, EXIF Orientation (or a custom module) would need to implement its own exif_orientation_imce_file_upload_validators_alter() function to add exif_orientation_validate_image_rotation() to $validators.

Either of these would allow EXIF Orientation (or other modules) to do its thing.

I've attached patches for each of these. If you wanted to do #2, we'd need to add an issue/patch to EXIF Orientation, too.

Added exif_orientation_validate_image_rotation as a validator before file_validate_image_resolution