Add expanded gaussian pair for hpmc #52

Job	Run time
Start / action runners	7s
${{ join(matrix.config, '_') }}	0s
cuda120_gcc11_py310_mpi_llvm / build	9m 44s
cuda120_gcc11_py310 / build	8m 44s
clang18_py312_mpi_tbb / build	4m 28s
cuda120_gcc11_py310_mpi_llvm_debug / build	8m 9s
gcc13_py312 / build	5m 52s
gcc14_py312_nohpmc / build	5m 21s
gcc14_py312_nomd / build	6m 9s
gcc14_py312_nomd_nohpmc / build	1m 59s
gcc9_py39 / build	6m 33s
gcc14_py312_nomd_nohpmc / pytest	59s
gcc14_py312_nomd_nohpmc / ctest	1m 6s
clang18_py312_mpi_tbb / ctest	1m 37s
clang18_py312_mpi_tbb / pytest	1m 37s
gcc14_py312_nohpmc / ctest	1m 14s
gcc14_py312_nohpmc / pytest	1m 3s
gcc13_py312 / ctest	1m 0s
gcc13_py312 / pytest	1m 21s
gcc9_py39 / ctest	58s
gcc9_py39 / pytest	1m 11s
cuda120_gcc11_py310_mpi_llvm_debug / ctest	4m 58s
cuda120_gcc11_py310_mpi_llvm_debug / pytest	9m 16s
gcc14_py312_nomd / ctest	1m 1s
gcc14_py312_nomd / pytest	1m 13s
cuda120_gcc11_py310 / pytest	2m 33s
cuda120_gcc11_py310 / ctest	1m 12s
cuda120_gcc11_py310_mpi_llvm / pytest	6m 18s
cuda120_gcc11_py310_mpi_llvm / ctest	2m 32s
Unit test	1s
	1h 38m 16s

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