Add stats section to job overlay

[yscik]

Fixes #2744, fixes #2745, fixes #2746

Changes Proposed in this Pull Request

• Add stats section and daily chart to job overlay
• Add accent color, with a script to auto-detect link color by default
• Fix/tune related styles, improve job overlay on mobile
• Add a dev cli command to generate stats
• Add search impression count to the dashboard and admin tables

Testing Instructions

• Open the [job_dashboard], and click on various jobs to view them.
• Generate stats to show by clicking around job search opening jobs, or by the CLI helper command: wp jm dev stats generate <postId>
• The daily views chart goes from publish date to expiration date, make sure those are realistic. Test data generation goes from publish date to current date.
• Check on a few themes. Chart color should pick up the site's link color.

New or Updated Hooks and Templates

• job_manager_job_stats_chart - Filter the data for the daily breakdown chart
• job_manager_job_stats_summary - Filter the sections and data for the summaries
• job_manager_ui_accent_color - Set an accent color manually

Screenshot / Video

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[thedebian]

Code looks good.
When opening the modal, the ajax fails, because I have a warning "Warning: Undefined array key "posts_per_page" in /var/www/html/wp-content/plugins/WP-Job-Manager/includes/class-job-dashboard-shortcode.php on line 636", it seems to come from this PR, there's no default set for posts_per_page and $args['posts_per_page'] is checked in the method.

Also had a bunch of other warnings once this one was fixed 😅 :

I could only get some stats after running the wp command, but that's maybe normal ?

Last (but not least), something's happening there and the pages hangs the Firefox tab for a while, after the modal is displayed:

[yscik]

Last (but not least), something's happening there and the pages hangs the Firefox tab for a while, after the modal is displayed

I suspect that's to do with the 100 years of stats it's supposed to render :D I'll put some sane limit on it.