Add util to get consolidated page_config from higher levels

[divyansshhh]

Required for jupyterlab/jupyterlab#16102

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[krassowski]

The linter is not happy yet:

jupyterlab_server/config.py: note: In function "_get_config_manager":
jupyterlab_server/config.py:396: error: "object" has no attribute "__iter__";
maybe "__dir__" or "__str__"? (not iterable)  [attr-defined]
            for p in paths[_level]:
                     ^~~~~~~~~~~~~
jupyterlab_server/config.py:398: error: Left operand of "and" is always true 
[redundant-expr]
            if write_config_dir is None and paths[_level]:
               ^~~~~~~~~~~~~~~~~~~~~~~~
jupyterlab_server/config.py:399: error: Value of type "object" is not indexable
 [index]
                write_config_dir = osp.join(paths[_level][0], config_name)
                                            ^~~~~~~~~~~~~~~~

[divyansshhh]

I think lint is fixed now.

[krassowski]

Still failing here:

jupyterlab_server/config.py:388:5: SIM108 Use ternary operator `levels = allowed[allowed.index(level):] if include_higher_levels else [level]` instead of `if`-`else`-block
Found 1 error.

IMO that's too pedantinc, but linter is a linter.

[krassowski]

LGTM thank you @divyansshhh =!

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[krassowski]

Released in https://github.com/jupyterlab/jupyterlab_server/releases/tag/v2.27.0