Add connection labels

[0x4d]

Closes #150

Describe your changes

• Calculate connection label position after import (needs renew-formalism-pt#24)
• Calculate connection label position in CreateLabelBehavior

[codecov]

Codecov Report

Merging #155 into master will decrease coverage by 0.22%.
The diff coverage is 20%.

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
- Coverage   63.16%   62.93%   -0.23%     
==========================================
  Files         154      154              
  Lines        1876     1886      +10     
==========================================
+ Hits         1185     1187       +2     
- Misses        691      699       +8

Impacted Files	Coverage Δ
src/features/import/providers/Importer.js	68.75% <0%> (-9.83%)	⬇️
src/core/Canvas.js	77.77% <0%> (-2.23%)	⬇️
...c/features/create/behaviors/CreateLabelBehavior.js	68.18% <40%> (-8.29%)	⬇️

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[tim-kilian]

Please generalize BBox method before merge.

[0x4d]

Please generalize BBox method before merge.

Will refactor the method signature tonight