fix: expose FilterXYSchema.json in exports

[targos]

Also fixes the readme with correct links.

BREAKING-CHANGE: The JSON schema must now be imported like this: import filterXY from 'ml-signal-processing/FilterXYSchema.json' with { type: 'json' };

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.52%. Comparing base (eca5d21) to head (bcd7b20).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   94.52%   94.52%           
=======================================
  Files          35       35           
  Lines         365      365           
  Branches       49       49           
=======================================
  Hits          345      345           
  Misses         19       19           
  Partials        1        1           

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[tpoisseau]

SGTM