Add a CMS toolbar item for category and tag list

[adrien-delhorme]

Description

Add links on the Blog toolbar menu, to manage BlogCategory and Tag, without visiting django admin site.

Checklist

• [x] I have read the contribution guide
• [x] Code lint checked via inv lint
• [x] changes file included (see docs) --> no issue number
• [x] Usage documentation added in case of new features --> not needed
• [x] Tests added

[yakky]

Thanks @adrien-delhorme for your contribution. I will merge this as soon as I have github actions back up and running

[yakky]

Thanks your contribution @adrien-delhorme , I merged this with #729 to ease porting to updated develop branch