Make CS tags by default equal to config key

[Helveg]

Adding a connectivity block in the configuration will now use its key to store the connections under, instead of always using the cell type names as X_to_Y.

[codecov[bot]]

Codecov Report

Merging #659 (e6bfa57) into main (d702e09) will decrease coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #659      +/-   ##
==========================================
- Coverage   71.83%   71.81%   -0.03%     
==========================================
  Files         102      102              
  Lines       14255    14234      -21     
==========================================
- Hits        10240    10222      -18     
+ Misses       4015     4012       -3     

Impacted Files	Coverage Δ
bsb/connectivity/strategy.py	88.60% <ø> (ø)
tests/test_util.py	100.00% <ø> (ø)
tests/test_connectivity.py	93.11% <100.00%> (-0.03%)	:arrow_down:
tests/test_issues.py	93.33% <0.00%> (-3.34%)	:arrow_down:
bsb/cell_types.py	70.17% <0.00%> (-3.27%)	:arrow_down:
bsb/services/__init__.py	91.66% <0.00%> (-1.67%)	:arrow_down:
bsb/placement/indicator.py	78.57% <0.00%> (-0.22%)	:arrow_down:
bsb/topology/partition.py	79.82% <0.00%> (-0.06%)	:arrow_down:
tests/test_configuration.py	99.52% <0.00%> (-0.01%)	:arrow_down:
... and 3 more

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