option to remove invisible output from importing hvplot.pandas/xarray

#### Is your feature request related to a problem? Please describe.
It's a (small) annoyance that every `import hvplot.pandas` or `import hvplot.xarray` creates some kind of invisible return object, even when using the `logo=False` option.

In Jupyter notebook it's a very small annoyance, as it's just one line of invisible output (Figure 1).
But inside `vscode` this one line becomes somehow several lines of output (Figure), which is a tad more annoying.

#### Describe the solution you'd like
An option to remove any output from importing holoviews/hvplot.

#### Describe alternatives you've considered
I tried `logo=False` to no avail.

#### Additional context

I discovered an interesting dependence on order sequence:

1. hv.extension("bokeh", logo=False)
2. import hvplot.pandas

This version doesn't create output for the `hvplot.pandas` anymore.

1. import hvplot.pandas
2. hv.extension("bokeh", logo=False)

This version creates output for both calls.

#### Version info
hvplot: 0.9.2
holoviews: 1.18.3