build: add --shared-nbytes configure flag

[aduh95]

nbytes is a dependency of libnode, it seems useful to be able to provide it as a shared dep instead of recompiling the vendored one.

[nodejs-github-bot]

Review requested:

• @nodejs/actions
• @nodejs/gyp

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.01%. Comparing base (0f15923) to head (61cfe1a).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61341      +/-   ##
==========================================
- Coverage   88.52%   88.01%   -0.51%     
==========================================
  Files         704      704              
  Lines      208739   208739              
  Branches    40276    40190      -86     
==========================================
- Hits       184776   183715    -1061     
- Misses      15972    16962     +990     
- Partials     7991     8062      +71     

see 108 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70769/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70776/