Add a CMS toolbar item for category and tag list

[yakky]

Description

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

References

Fix #676

Checklist

• I have read the contribution guide
• Code lint checked via inv lint
• changes file included (see docs)
• Usage documentation added in case of new features
• Tests added

[github-actions]

Coverage: 97.093% (+0.09%) from 97.001% when pulling f9cc38c on feature/issue-676 into c6f85df on develop.

[github-actions]

Coverage: 96.961% (-0.04%) from 97.001% when pulling f9cc38c on feature/issue-676 into c6f85df on develop.

[codecov]

Codecov Report

Patch coverage: 90.90% and project coverage change: -0.03 ⚠️

Comparison is base (c6f85df) 94.26% compared to head (f9cc38c) 94.24%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #729      +/-   ##
===========================================
- Coverage    94.26%   94.24%   -0.03%     
===========================================
  Files           26       26              
  Lines         1813     1823      +10     
  Branches       260      260              
===========================================
+ Hits          1709     1718       +9     
- Misses          52       53       +1     
  Partials        52       52              

Flag	Coverage Δ
unittests	94.24% <90.90%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
djangocms_blog/admin.py	83.06% <ø> (ø)
djangocms_blog/managers.py	92.50% <80.00%> (-0.55%)	⬇️
djangocms_blog/cms_toolbars.py	100.00% <100.00%> (ø)
djangocms_blog/feeds.py	85.03% <100.00%> (ø)
djangocms_blog/models.py	98.01% <100.00%> (+<0.01%)	⬆️

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