[PWGHF] Add QA histograms to XicToXiPiPi candidate selector

[pstahlhu]

@JaeYoonCHO @sh-lim @klsmith15k

• Add $\Sigma p_{\rm{T}}(\pi\leftarrow\Xi_{c}^{+})$ cut
• Add QA histograms for daughter track properties to candidate selector: $\eta$, TPC clusters and crossed rows of all final state daughter particles; ITS clusters of $\pi$ from $\Xi_{c}^{+}$
• Improve counter histogram filling conditions
• Fill counter histograms in candidate creator and selector by default, and make filling of other histograms configurable

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 0 warnings, 🔕 1 disabled

[fgrosa]

Just a couple of minor comments from my side!

[fgrosa]

Use TH1D for 1D histograms to avoid truncation of bin content in case of large number of entries

Suggested change

	registry.add("hVertexerType", "Use DCAFitter or KFParticle;;entries", {HistType::kTH1F, {{2, -0.5, 1.5}}});
	registry.add("hVertexerType", "Use DCAFitter or KFParticle;;entries", {HistType::kTH1D, {{2, -0.5, 1.5}}});

[fgrosa]

Suggested change

	registry.add("hCandCounter", "hCandCounter", {HistType::kTH1F, {{4, -0.5, 3.5}}});
	registry.add("hCandCounter", "hCandCounter", {HistType::kTH1D, {{4, -0.5, 3.5}}});

[pstahlhu]

Hi @fgrosa, thank you for your comments!
I changed the candidate counter histograms to TH1D in both the creator and selector, but I don't think that it's necessary for the hVertexerType, since this is only filled once in the init function. I don't think that this histogram is too important anyway, but it's a nice counter of how many output files were merged in the case of merged output.

I also split the $\eta$ cut in order to be able to apply different cuts on the $\pi$ coming from $\Xi_{c}^{+}$ and the daughters of the $\Xi$.

I run am running a local test at the moment and then will update the PR accordingly.