[MRG] Feature synchronizer

[charavelg]

new preprocessing to deal with acquisition of features at different sampling rates or desynchronized timestamps.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.92%. Comparing base (95bd2d3) to head (ab8f105).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #678      +/-   ##
==========================================
+ Coverage   93.85%   93.92%   +0.06%     
==========================================
  Files          74       76       +2     
  Lines        7081     7159      +78     
==========================================
+ Hits         6646     6724      +78     
  Misses        435      435              

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