Feature/oaw 30 adr linter

[Floris272]

Partially fixes maykinmedia/open-api-workflows#30

Changes

• adds api-version header to api and spec file
• adds adr api spec spectral file for linting

[codecov-commenter]

Codecov Report

❌ Patch coverage is 55.55556% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.08%. Comparing base (7a50add) to head (d701293).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
src/objects/utils/autoschema.py	30.00%	7 Missing ⚠️
src/objects/utils/oas_extensions/views.py	66.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #676      +/-   ##
==========================================
- Coverage   82.37%   82.08%   -0.30%     
==========================================
  Files         130      131       +1     
  Lines        2451     2489      +38     
  Branches      198      201       +3     
==========================================
+ Hits         2019     2043      +24     
- Misses        391      403      +12     
- Partials       41       43       +2     

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