Use the new DB editor facilities in Toolbox

[soininen]

Data stores are no longer responsible of Database editor's tab names. They merely register their names as candidates for database display names but it is up to Toolbox what it chooses to do with the information. This simplifies code and responsibilities in spine_items.

No associated issue.

Checklist before merging

• Documentation (also in Toolbox repo) is up-to-date
• Release notes in Toolbox repo have been updated
• Unit tests have been added/updated accordingly
• Code has been formatted by black & isort
• Unit tests pass

[codecov]

Codecov Report

Attention: Patch coverage is 48.48485% with 17 lines in your changes missing coverage. Please review.

Project coverage is 62.84%. Comparing base (3b170a5) to head (8f1e282).

Files with missing lines	Patch %	Lines
spine_items/view/view.py	15.38%	11 Missing ⚠️
spine_items/data_store/data_store.py	68.42%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #233      +/-   ##
==========================================
+ Coverage   62.81%   62.84%   +0.03%     
==========================================
  Files         168      168              
  Lines       17697    17709      +12     
  Branches     2048     2051       +3     
==========================================
+ Hits        11117    11130      +13     
  Misses       5989     5989              
+ Partials      591      590       -1     

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