Add option to set theme used for entity_print rendering

I was unable to apply the latest patch using:
Drupal core 9.4.10
Entity Print 8.x-2.11

Regarding the previous comment, we were using both this patch and the one in 2996197: Use absolute paths in css ✨ Use absolute paths in css Needs work which resulted in a patching conflict.

Attached is a patch which combines both.

This is looking great, we just need a BC layer for the service constructor changes in case someone has sub-classed the services.

So default the new arguments to null, if they're not set, use trigger_error to trigger a deprecation and set it using \Drupal.

Here's an example from core - https://git.drupalcode.org/project/drupal/-/blob/10.1.x/core/lib/Drupal/...

We also need a change notice so we have something to link to, there's a link at the top of this page to 'add change notice'

Thanks again, nice work adding an upgrade path 🤌

FYI, we've been using the patch/MR here along with the one in ✨ Support multiple view modes for a given library Needs review , and found managing the two patches at once to be cumbersome. As such, I've created a custom fork that incorporates both, here: https://gitlab.com/consensus.enterprises/drupal/entity_print/-/commits/d...

I am guessing this would require other modules to update dependency injection. Seeing this trying to use this patch on commerce orders:

ArgumentCountError: Too few arguments to function Drupal\entity_print\Renderer\ContentEntityRenderer::__construct(), 5 passed in /var/www/html/web/modules/contrib/commerce/modules/order/src/EntityPrint/OrderRenderer.php on line 50 and exactly 7 expected in Drupal\entity_print\Renderer\ContentEntityRenderer->__construct() (line 60 of /var/www/html/web/modules/contrib/entity_print/src/Renderer/ContentEntityRenderer.php).

MR 16 conflicts with #2971822 🐛 Allow users to choose whether to optimize css. RTBC .

About #39 the error message in commerce order there is already an issue ( Commerce #3336653 💬 Support setting theme for entity print patch Needs review ), added it as child issue.

Same as @spiderman, I'm using patch #44 from https://www.drupal.org/project/entity_print/issues/2884806 ✨ Support multiple view modes for a given library Needs review (Support multiple view modes for a given library) and this patch conflicts with it. I tried adapting the patch locally to work with the patch from this current issue but no luck. Also tried @spiderman's fork (Merge branch '2884806-support-multiple-view-modes' into develop commit) but no luck either. I'm on:

Drupal 10.1.4
entity print 8.x-2.13
using the patches:
https://www.drupal.org/files/issues/2023-01-21/support-multiple-view-mod... →
https://www.drupal.org/files/issues/2023-07-10/entity_print-dompdf_page_... →

I could fix it in a hook_preprocess_entity_print:

$css = '
';
$variables['entity_print_css'] = Markup::create($css);

It's not ideal but it works, none of the patches provided worked for me unfortunatelly.