Don't import Dask when Panel serving an app

[hoxbro]

Dask is imported when running the following:

import sys
import panel as pn
pn.panel("dask" in sys.modules).servable()

The import is happening here:

lumen/lumen/sources/base.py

Line 38 in af86b04

import dask.dataframe as dd

Where Lumen is called in Panel here:
https://github.com/holoviz/panel/blob/86a05a3c080d5cd39af7280793db8e6cd42a3783/panel/io/rest.py#L182

[hoxbro]

Running python -X importtime -c "import panel.io.rest" 2> log.txt && tuna log.txt I can see that lumen uses around half of the import time.

[philippjfr]

Yeah, the dask import should be lazy.

[github-actions]

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