Add a Generate Alt text VBO plugin to generate alt text for selected medias

This is the first draft of managing bulk alt text generation with AI as an action plugin for VBO.
It could be placed in its own sub-module, depending on Views Bulk Operations (VBO).

Removing none-relevant info.

I'm so happy to find a solution for the problem I have (and many others too)...
Just one question: Do this action respects the language of the entity - for generating the ALT-Text ?

I don't think so... I think two enhancements to this module:

- Have the alt text generation understand the text it appears it and the content.
- Have it be passed the language.

This are small changes.

This feature is awesome btw!

IMO, the integration with VBO could be added as a submodule since we already have the submodule ai_image_bulk_alt_text for this purpose.
Including the VBO action integration within the main module would introduce a dependency on the contributed VBO module, requiring users to install it even if they do not always need it while using the default features of ai_image_bulk_alt_text

Yes, Prashant
Working on

Add a sub-module named vbo_generate_alt_text to separate the logic for when the VBO module is in use.

It was listed in the summary
doing that in the 3504027-option2-sub-module-vbo_generate_alt_text branch

Somehow not able to see this new VBO action as an administrator:

1. Downloaded and installed VBO module
2. On the 3504027-add-a-vbo-pluginbranch
3. Visited Media listing page admin/content/media
4. Able to see other bulk operation actions like "Delete media", "Publish media" etc but "Generate Alt text" not listed

Not sure if i am missing something here.