Add tags to the loading of morphologies.

[drodarie]

Describe the work done

Add config for tags. Add tags to loading functions for morphologies.

Tasks

• [x] Added tests
• [x] Updated documentation

[codecov[bot]]

Codecov Report

Merging #727 (0e35ee4) into main (53bf5d0) will increase coverage by 0.03%. The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main     #727      +/-   ##
==========================================
+ Coverage   74.22%   74.26%   +0.03%     
==========================================
  Files         134      134              
  Lines       15663    15677      +14     
==========================================
+ Hits        11626    11642      +16     
+ Misses       4037     4035       -2     

Impacted Files	Coverage Δ
bsb/storage/_files.py	82.22% <66.66%> (+0.14%)	:arrow_up:
bsb/morphologies/__init__.py	81.07% <100.00%> (+0.20%)	:arrow_up:
tests/test_morphologies.py	99.86% <100.00%> (+<0.01%)	:arrow_up: