[Meta] PET D8 port meta issue

Meta task list:

1. Create info.yml file. - #2366823: Convert .info into .info.yml file
2. Create menu's for listing, add, edit, delete, import and settings pages. - #2366825: Convert hook menu to menu route
3. Migrate schema as per D8 format. - #2366827: Migrate schema as per D8 format
4. Migrate permissions as per D8 format. - #2366829: Migrate permissions as per D8 format
5. Migrate PET Entity and controller functions. - #2366835: Migrate PET Entity and controller functions
6. Port List PET form. - #2366837: Port List PET form
7. Port add PET form. - #2366839: Port add PET form
8. Port edit PET form. - #2366841: Port edit PET form
9. Port delete PET form. - #2366845: Port delete PET form
10. Port import PET form and functionality. - #2366847: Port import PET form and functionality
11. Migrate settings page. - #2366849: Migrate settings page
12. Migrate Token integration - #2366851: Migrate Token integration
13. Migrate Mime Mail integration - #2366853: Migrate Mime Mail integration
14. Port Send email functionality. - #2366855: Port Send email functionality
15. Rules Action plugin fixes #3096079: Syntax and other issues in Action plugin