[Python][UHI] Extend TH1 equality operator to consider additional properties

[siliataider]

This Pull request:

Changes or fixes:

The equality operator for ROOT histograms now compares the following properties:

• Histogram type (including dimension).
• Histogram kind.
• Shape (number of bins per axis).
• Bin contents array.
• Sum-of-weights-squared array.
• Axes properties.

Checklist:

• tested changes locally
• updated the docs (if necessary)

This PR fixes #19038

[vepadulano]

LGTM, but let's wait for discussion with @guitargeek

[siliataider]

@guitargeek I did not add checks for properties related to the GUI. We should discuss if those are part of determining whether 2 ROOT histograms are equal or not

[github-actions]

Test Results

    19 files      19 suites   3d 19h 14m 36s ⏱️
 2 856 tests  2 856 ✅ 0 💤 0 ❌
52 746 runs  52 746 ✅ 0 💤 0 ❌

Results for commit e91727f.

[dpiparo]

A discussion might be needed. I personally lean towards not considering aspects such as colours or marker type part of the equality: they are not related to the statistical properties of the histos and in any case those will not be part of the new histograms...