[ESSNMX] Save TOF 1d histogram

[YooSunYoung]

Fixes #267

Command to test:

pixi run --frozen essnmx-reduce \
    --output-dir aux \
    --input-file ${HOME}/.cache/ess/nmx/small_nmx_nexus.hdf.zip.unzip/small_nmx_nexus.hdf \
    --output-file test.hdf \
    --overwrite --nbins 50

Then it should save png file in the aux/ directory and test.hdf should have /entry/aux/tof-1d.

[github-actions]

Hi! Your PR was missing some labels 🔖 so I added them: essnmx
Hi Again 👋! I added the missing prefix: [ESSNMX] to the title.

[YooSunYoung]

Hmm I think I'll change where the auxiliary stuff is saved in the nxlauetof file.... Done...!