Issue470 adding nap classification to part5

[vincentvanhees]

See #470. This PR adds a first nap classification model that was trained in hip data from 3.5yr olds. Classified naps are added to the time series and part 5 csv report. Code is designed to allow for newer/better models to be added in the future.

Checklist before merging:

• Existing tests still work (check by running the test suite, e.g. from RStudio).
• Added tests (if you added functionality) or fixed existing test (if you fixed a bug).
• Updated or expanded the documentation.
• Updated release notes in inst/NEWS.Rd with a user-readable summary. Please, include references to relevant issues or PR discussions.
• Added your name to the contributors lists in the DESCRIPTION and CITATION.cff files.

[codecov-commenter]

Codecov Report

Merging #476 (ad3a402) into master (4a36175) will decrease coverage by 0.14%.
The diff coverage is 67.54%.

@@            Coverage Diff             @@
##           master     #476      +/-   ##
==========================================
- Coverage   75.00%   74.85%   -0.15%     
==========================================
  Files          86       87       +1     
  Lines       10629    10705      +76     
==========================================
+ Hits         7972     8013      +41     
- Misses       2657     2692      +35     

Impacted Files	Coverage Δ
R/g.part5.R	69.02% <62.94%> (-3.23%)	⬇️
R/g.part5.classifyNaps.R	90.62% <90.62%> (ø)
R/g.shell.GGIR.R	82.81% <100.00%> (+0.20%)	⬆️

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