Support defining only an orchestrator connector

[olivierdupuis]

At the moment, commands require specific types of connectors to get data. But we really only need an orchetrator connector type to get the basic functionalities working. When currently running a command with only an orchestrator connector, I get the following error...

olivierdupuis@MacBook-Pro damn % sudo poetry run damn metrics gdelt/gdelt_gkg_articles
Password:
Traceback (most recent call last):
  File "/Users/olivierdupuis/git/discursus/damn/damn_tool/utils/helpers.py", line 64, in load_config
    first_key = list(config[connector].keys())[0]
KeyError: 'io-manager'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/olivierdupuis/git/discursus/damn/.venv/lib/python3.9/site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
  File "/Users/olivierdupuis/git/discursus/damn/.venv/lib/python3.9/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
  File "/Users/olivierdupuis/git/discursus/damn/.venv/lib/python3.9/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/olivierdupuis/git/discursus/damn/.venv/lib/python3.9/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/olivierdupuis/git/discursus/damn/.venv/lib/python3.9/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "/Users/olivierdupuis/git/discursus/damn/damn_tool/metrics.py", line 164, in metrics
    orchestrator_connector, io_manager_connector, data_warehouse_connector = init_connectors(orchestrator, io_manager, data_warehouse)
  File "/Users/olivierdupuis/git/discursus/damn/damn_tool/utils/helpers.py", line 32, in init_connectors
    io_manager_connector_type, io_manager_config = load_config('io-manager', io_manager)
  File "/Users/olivierdupuis/git/discursus/damn/damn_tool/utils/helpers.py", line 69, in load_config
    raise ValueError(f"No configuration found for connector '{connector}' with profile '{profile}'")
ValueError: No configuration found for connector 'io-manager' with profile 'None'

[olivierdupuis]

30 - Gracefully fail when passing an non-existant asset name

[olivierdupuis]

30 - Support defining only an orchestrator connector