feat: implement OpenAPI documentation (#162)

[holtgrewe]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 60.70039% with 101 lines in your changes missing coverage. Please review.

Project coverage is 68.56%. Comparing base (162a134) to head (3e6fa76).
Report is 4 commits behind head on main.

Files	Patch %	Lines
src/server/run/mod.rs	9.52%	76 Missing ⚠️
src/server/schema.rs	0.00%	15 Missing ⚠️
src/main.rs	0.00%	5 Missing ⚠️
src/server/run/hpo_genes.rs	98.18%	1 Missing ⚠️
src/server/run/hpo_omims.rs	97.87%	1 Missing ⚠️
src/server/run/hpo_sim/term_gene.rs	92.85%	1 Missing ⚠️
src/server/run/hpo_sim/term_term.rs	92.30%	1 Missing ⚠️
src/server/run/hpo_terms.rs	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
- Coverage   70.59%   68.56%   -2.03%     
==========================================
  Files          13       13              
  Lines         874      913      +39     
==========================================
+ Hits          617      626       +9     
- Misses        257      287      +30     

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