New task provider: Improve PDF handling

[ilicfilip]

Implements #649

Things to do:

• Replace placeholder and temporary text
• Improve styling, for example when plugin is installed
• Add data collector for checking the number of PDFs (so query is not ran on every page load)

EDIT:
XML Sitemap for PDFs for Yoast SEO requires Yoast SEO plugin to be active, do we skip suggesting it if Yoast SEO is not active or nudge user to activate it as well?

If we do suggest user to activate Yoast SEO we probably should check if other SEO plugins are active first, so which ones to include in the check?

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[aristath]

@ilicfilip what's missing on this one? Is it ready for review, or still a draft?

[ilicfilip]

@aristath , decision on:

_XML Sitemap for PDFs for Yoast SEO requires Yoast SEO plugin to be active, do we skip suggesting it if Yoast SEO is not active or nudge user to activate it as well?

If we do suggest user to activate Yoast SEO we probably should check if other SEO plugins are active first, so which ones to include in the check?_

[aristath]

@ilicfilip I think both of these were already addressed in #676 yesterday 👍

[ilicfilip]

I have updated the task so:

• It will be created if user has more than 10 PDF files in the media library
• The first step recommends the premium PDF Library plugin
• If the user doesnt have Yoast SEO active there will be no 2nd step and user can collect the point
• If the Yoast SEO is active user can advance to the 2nd step from where it can install / activate the PDF Sitemap add on.

What needs to be done:

• Priority needs to be set correctly, so this task loads after the "Install SEO plugin" task
• Wording needs to be adjusted, as it is mostly Lorem ipsum text now

[aristath]

Should this task only be added if the user has Yoast-SEO installed? 🤔
If they have some other SEO plugin installed this doesn't make a lot of sense

[ilicfilip]

Yes, but "The first step recommends the premium PDF Library plugin"

So we recommend something in any case

[aristath]

@ilicfilip I pushed 2 commits here:

1. Fix inconsistent cache key (pdf_files_count, pdf_count)
2. Replaced lips text with a reasonable description:

Adding an XML sitemap for your PDF files helps search engines discover and index them more effectively. This can improve visibility in search results and drive more organic traffic to your valuable PDF content.