Support for `jupyter.runStartupCommands`

[indrex]

Environment:

• VSCode (latest)
• Jupyter and ruff extensions

Issue:

• Jupyter allows some commands to be run at startup
• This can be tested using jupyter.runStartupCommands in VSCode settings
• If I import a module using this, it is not recognized by ruff
• It lints the import wondering where did it come from

Expected resolution:

• Look at the auto imports, or the available namespace variables
• Allow a setting to let ruff know of such imports?

Example: import pandas as pd is run at startup

[dhruvmanila]

Related: https://github.com/astral-sh/ruff/issues/9644