[Improve]: Improve run time of script makeTxtFileForPlotting.py.

[ram1123]

Currently this script (link) takes ~2hrs of running time.

Need to improve timing performance of this script.

I already updated this script here. It takes ~5-10 mins to run. But this requires uproot to run. But on lxplus we can't use the uproot. So, think of alternative.

[ram1123]

first attempt: ram1123@82dbaa7