chore: Add pybind11 as a thirdparty component

[paulgessinger]

This is in preparation for the python bindings #845.

When this is merged, #845 will have reduced changes.

[asalzburger]

Just to clarify, that is a copy into third party, right?

[paulgessinger]

Yes

[codecov]

Codecov Report

Merging #964 (021f317) into main (b87b53c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #964   +/-   ##
=======================================
  Coverage   48.46%   48.46%           
=======================================
  Files         334      334           
  Lines       17067    17067           
  Branches     8074     8074           
=======================================
  Hits         8271     8271           
  Misses       3094     3094           
  Partials     5702     5702           

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