Demonstration of pinned-thread resource

[knoepfel]

This PR is a WIP. It is intended to demonstrate that the (eventual) resources system can handle resources like Geant4 that require pinning work on specific threads.

As the number of threads is generally configurable at run-time, it will be easiest to support pinned-thread resources is we have a feature similar to that requested in uxlfoundation/oneTBB#2131.

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N.B.: An error was occasionally encountered in the resource_limited_threads test where a data race would appear, manifesting as either a dead lock or a disallowed access of the std::optional argument in the managed_thread class template. This seems to have been resolved with uxlfoundation/oneTBB#2103 (i.e., the resource_limited_threads test now reliably executes successfully).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main     #730   +/-   ##
=======================================
  Coverage   83.71%   83.71%           
=======================================
  Files         172      172           
  Lines        6904     6904           
  Branches      845      845           
=======================================
  Hits         5780     5780           
  Misses        847      847           
  Partials      277      277           

Flag	Coverage Δ
scripts	78.93% <ø> (ø)
unittests	85.83% <ø> (ø)

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