Return schema info from JSON reader

[vuule]

Description

Populate the schema_info structure (in addition to column_names) to match the behavior of a (future) JSON reader that supports nested columns.
Use the schema_info in Cython to set the struct columns' field names (unused until nested type support is added).

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

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[vyasr]

Both Python and C++ changes look fine to me.

[vyasr]

I guess you moved the _from_data call into the Cython because update_struct_field_names has to happen in Cython? In the long term I think that probably indicates some level of restructuring is required, but we can deal with that when we get around to cuIO/Cython refactoring more broadly.

[vuule]

@gpucibot merge