Replace deprecated pkg_resources

[Finesim97]

Closes #378

I just replaced the pkg_resources function with the corresponding Importlib.metadata calls.

Old code, explodes:

import pkg_resources

for entry_point in pkg_resources.iter_entry_points('jupyter_serverproxy_servers'):
    name = entry_point.name
    print(name)
    server_process_config = entry_point.load()()
    print(server_process_config)

New code, might explode behind closed doors:

from importlib.metadata import entry_points

for entry_point in entry_points().select(group='jupyter_serverproxy_servers'):
    name = entry_point.name
    print(name)
    server_process_config = entry_point.load()()
    print(server_process_config)

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[Finesim97]

The tests fail, because under 3.8 the dict access to the entrypoints should be used, while from 3.10 onward the select function should be used, it produces a warning there. I will look at your code to try to find out how to do something like this.

[Finesim97]

Just saw #396, closing this one