[PWGHF] Refactor data creator for HF correlations

[Marcellocosti]

Tests on hy with the current code produce very large outputs due to the large track multiplicity in OO collisions, especially for the D0 and D+ mesons. Therefore, in this PR, the data model is reshaped: separate process functions are implemented for the creation of Same Event and Mixed Event derived datasets, introducing pt- and centrality dependent down sample factors to handle the event mixing output size and the case of hadron-hadron correlations. This implementation also allows to get rid of the index columns in the output, as daughter-candidate pairs are rejected online.

Tagging @stefanopolitano, @scattaru, @wuctlby.

[github-actions]

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

[alibuild]

Error while checking build/O2Physics/o2 for 550c7ee at 2025-09-18 01:10:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/12989-slc9_x86-64/0/PWGHF/HFC/TableProducer/derivedDataCreatorCorrelationsReduced.cxx:288:3: error: control reaches end of non-void function [-Werror=return-type]
ninja: build stopped: subcommand failed.

Full log here.

[vkucera]

Converted to draft because of compilation errors.

[stefanopolitano]

Hi @Marcellocosti ! Thanks a lot for implementing the code with the suggestions we discussed offline. For me this version is fine and we can proceed