feat: add several scikit-hep python packages

This PR adds a few scikit-hep python packages to ensure that they are pre-installed and available for benchmarks (without pulling them in when the requirements.txt is called).

hepunits~=2.3.2
hist~=2.6.1
histoprint~=2.4.0
particle~=0.23.0
vector~=0.8.5

Note: The version of vector will be updated to the latest 1.4.0, but that will take a bit longer.

spack-environment/xl/spack.yaml

@@ -68,6 +68,9 @@ spack:
   - py-dask
   - py-deepdiff
   - py-epic-capybara
+  - py-hepunits
+  - py-hist
+  - py-histoprint
   - py-ipython
   - py-jinja2
   - py-jinja2-cli
@@ -82,6 +85,7 @@ spack:
   - py-onnx
   - py-onnxruntime
   - py-pandas
+  - py-particle
   - py-pip
   - py-pre-commit
   - py-pycairo
@@ -91,6 +95,7 @@ spack:
   - py-toml
   - py-torch
   - py-uproot
+  - py-vector
   - py-wurlitzer
   - py-yapf
   - root +opengl +webgui +x