lib-core: useExtensions code improvement

[logonoff]

this PR aims to make useExtensions faster and more readable:

• The fallback () => true predicate is moved to the module level and is given a name (truePredicate) and is now set as the default param for predicate. We also no longer create this function every iteration of the loop
• Instead of the complex extensions.reduce, we simply use filter which makes the intent behind our goal (i.e., filtering an array) more clear. This also reduces the amount of intermediary arrays that are created when computing this

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 18.25%. Comparing base (7dd14fe) to head (3626501).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/lib-core/src/runtime/useExtensions.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #299   +/-   ##
=======================================
  Coverage   18.25%   18.25%           
=======================================
  Files          58       58           
  Lines        1758     1758           
  Branches      326      327    +1     
=======================================
  Hits          321      321           
  Misses       1421     1421           
  Partials       16       16           

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[logonoff]

/retitle lib-core: useExtensions code improvement

[vojtechszocs]

/lgtm

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