feat: Optional support to add c++ typenames to parameters with ak_add_typename in uproot.dask

[prayagyadav]

Optional support to add c++ typenames to parameters with ak_add_typename in uproot.dask

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Necessity:

• Access to C++ typename info for each tree branch is essential in building COFFEA schema for files generated with EDM4HEP.

• Similar to how ak_add_doc is used to add the __doc__ parameter to forms, ak_add_typename could be used to add the C++ typename of the branch in parameters.

• This is an attempt to solve this feature request #1369 posted by @ianna in response to the discussions among @jpivarski @ianna @davidlange6 and @prayagyadav

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Outcome/Example/Expected output:

Bash:

wget https://github.com/prayagyadav/coffea/raw/refs/heads/test-typenames-swan/tests/samples/p8_ee_WW_ecm240_edm4hep.root

Python:

file = "p8_ee_WW_ecm240_edm4hep.root"
tree = "events"
events = uproot.dask(file+":"+tree, open_files=False, ak_add_doc=True,  ak_add_typename=True)

events.Particle.form.parameters

Output:

{'__doc__': 'Particle_', 'typename': 'vector<edm4hep::MCParticleData>'}

Here is the live link to the notebook for the above example, where one can run these cells in real-time.

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The bulk of the idea for these code changes was given by @davidlange6

[ianna]

@prayagyadav - Looks great, thanks! Could, please, add a test? There is a skhep_testdata package with a number of root files already in the repository. We usually name the tests with a corresponding PR number, for example:
tests/test_0652_dask_for_awkward.py

Thanks!