Ability to disable automatic definitions reloading when running dagster-dev locally

[garethbrickman]

What's the use case?

When trying to use a debugger, stepping through the code breaks when the automatic definition reload happens.

As a workaround, I can run dagster-webserver instead of dagster-dev so I get the UI without the daemons that execute the automatic reload, however there may be situations where we need to debug with the daemons running.

Ideas of implementation

It looks like it could be controlled via this constant: https://github.com/dagster-io/dagster/blob/master/python_modules/dagster/dagster/_daemon/controller.py#L50

Additional information

No response

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