refactor(gen, doc): rename mdk to fdk

[j03-dev]

Migration notes

...

• The change comes with new or modified tests
• Hard-to-understand functions have explanatory comments
• End-user documentation is updated to reflect the change

[linear]

MET-602 (docs,gen) replace phrase `mdk` with `fdk`

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #851   +/-   ##
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  Coverage        ?   76.26%           
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  Files           ?      145           
  Lines           ?    16796           
  Branches        ?     1649           
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  Hits            ?    12810           
  Misses          ?     3967           
  Partials        ?       19           

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