Refine LHCb analysis example

[bernhardmgruber]

• Improve terminal output
• Switch to C++20 (following ROOT's C++20 support)
• Show how to download the input file
• Add missing columns and preserve file order
• Avoid "_copy" in dumped ROOT histograms
• Add another mapping grouping H1ProbK with the ..isMuons
• Refactor file writing
• Allow to customize bits for layout 6 and 8
• Dump smaller layout visualization
• Including a few missing bitpack runs

[codecov[bot]]

Codecov Report

Merging #741 (be35122) into develop (77fb27d) will not change coverage. The diff coverage is 100.00%.

:exclamation: Current head be35122 differs from pull request most recent head 4b2f936. Consider uploading reports for the commit 4b2f936 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #741 +/- ## ======================================== Coverage 98.80% 98.80% ======================================== Files 75 75 Lines 7212 7212 ======================================== Hits 7126 7126 Misses 86 86 ```