refactor: names and test fixes

[rafbcampos]

Description

• Rename FLUENT to FUNCTIONAL following the last changes
• Remove the null from the serialized Python results
• Fix issue with declaration files being truncated (old webpack logic)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.89%. Comparing base (609e072) to head (5bb3770).
⚠️ Report is 8 commits behind head on migration.

Additional details and impacted files

@@              Coverage Diff              @@
##           migration       #2      +/-   ##
=============================================
+ Coverage      76.09%   76.89%   +0.80%     
=============================================
  Files            123      109      -14     
  Lines          10750    10133     -617     
  Branches        1752     1764      +12     
=============================================
- Hits            8180     7792     -388     
+ Misses          2551     2322     -229     
  Partials          19       19              

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[KetanReddy]

non local deps don't need to be linked in this package.json, it should be done through the build file