nanoevents uproot mapping in coffea v0.7.15 needs update for changes in uproot v4.2.4 (.awkward_form method)

[btovar]

Describe the bug

As seen in uproot issue scikit-hep/uproot5#614, the arguments of the .awkward_form method used in https://github.com/CoffeaTeam/coffea/blob/532c69afc8f837c6886542727d493b274d2e2c78/coffea/nanoevents/mapping/uproot.py#L94 have changed. The method now takes a second required argument context. To preserve the current default behavior, this argument should be set to:

{"index_format": "i64", "header": False, "tobject_header": True, "breadcrumbs": ()}

I have not checked if this method is used somewhere else in coffea. I can make this pr if you want.

[jpivarski]

Well, actually, that's our fault; Uproot will change back. The method didn't have a leading underscore, so it's public and we (I) shouldn't be changing the interface without warning like that.

@aryan26roy is making the Interpretation.awkward_form methods accept the same arguments that they used to (which then immediately create the new context and pass that down through a bunch of internal awkward_form functions, separate from the Interpretation.awkward_form). Coffea will not need to change.

This will be deployed as Uproot 4.3.0, first in a line of bug-fix releases for Uproot 4, tagged from the new main-v4 branch. It will also be a test of this new v4 bug-fix workflow.

[jpivarski]

See scikit-hep/uproot5#614 (comment).