refactor: use map for import descriptions + re-export descriptions

[dnalborczyk]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

Description

[codecov]

Codecov Report

Merging #4404 (26e8a52) into master (16c3b24) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4404      +/-   ##
==========================================
- Coverage   98.72%   98.72%   -0.01%     
==========================================
  Files         204      204              
  Lines        7321     7319       -2     
  Branches     2081     2081              
==========================================
- Hits         7228     7226       -2     
  Misses         34       34              
  Partials       59       59              

Impacted Files	Coverage Δ
src/Graph.ts	100.00% <100.00%> (ø)
src/Module.ts	100.00% <100.00%> (ø)

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