Hardcopy of pybind11 instead of using git submodules (#552)

* removed pybind as submodule
* added hardcopy of pybind11 2.10.0
* rename pybind11 folder to avoid conflicts when changing branch

Co-authored-by: Dhanya Thattil <dhanya.thattil@psi.ch>

libs/pybind/tests/pytest.ini

@@ -0,0 +1,22 @@
+[pytest]
+minversion = 3.10
+norecursedirs = test_* extra_*
+xfail_strict = True
+addopts =
+    # show summary of tests
+    -ra
+    # capture only Python print and C++ py::print, but not C output (low-level Python errors)
+    --capture=sys
+    # Show local info when a failure occurs
+    --showlocals
+log_cli_level = info
+filterwarnings =
+    # make warnings into errors but ignore certain third-party extension issues
+    error
+    # somehow, some DeprecationWarnings do not get turned into errors
+    always::DeprecationWarning
+    # importing scipy submodules on some version of Python
+    ignore::ImportWarning
+    # bogus numpy ABI warning (see numpy/#432)
+    ignore:.*numpy.dtype size changed.*:RuntimeWarning
+    ignore:.*numpy.ufunc size changed.*:RuntimeWarning