Add Scene function to use Hvplot backend visualization

[bornagain1981]

This pull request is my attempt to do something similar to "to_geoviews" function.
Hvplot syntax is easier than geoviews. In this case input datasets are optional. If no dataset is selected as input all scene variable keys is plotted and available in the output as obj.variable
It is no very fast, especially when there are many datasets and/or high definition coastlines. But for the time being it is ok. Future improvements may be to use multiprocessing library inside the function.

[bornagain1981]

I added hvplot in extra and test sections of setup.py . But hvplot not found error keeps happening

[djhoese]

Add it to https://github.com/pytroll/satpy/blob/main/continuous_integration/environment.yaml

Also, please wrap the import in scene.py in a try/except like:

try:
    import hvplot
except ImportError:
    hvplot = None

then later in your code do something like if hvplot is None: raise ImportError("'hvplot' must be installed to use this feature")

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (56df5da) 95.35% compared to head (9b0bcae) 95.35%.

Files	Patch %	Lines
satpy/scene.py	90.90%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2106      +/-   ##
==========================================
- Coverage   95.35%   95.35%   -0.01%     
==========================================
  Files         371      371              
  Lines       52464    52521      +57     
==========================================
+ Hits        50028    50082      +54     
- Misses       2436     2439       +3     

Flag	Coverage Δ
behaviourtests	4.15% <3.44%> (-0.01%)	⬇️
unittests	95.97% <94.82%> (-0.01%)	⬇️

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[coveralls]

Coverage: 95.264% (-0.06%) from 95.329% when pulling 09ad15d on bornagain1981:main into b92fe9e on pytroll:main.

[coveralls]

Pull Request Test Coverage Report for Build 7220473626

• 55 of 58 (94.83%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall first build on main at 95.919%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
satpy/scene.py	30	33	90.91%

Totals
Change from base Build 7220123684:	95.9%
Covered Lines:	50208
Relevant Lines:	52344

---

💛 - Coveralls

[mraspaud]

Suggested change

	if hvplot_xarray is None:
	raise ImportError("'hvplot' must be installed to use this feature")
	import hvplot.xarray as hvplot_xarray

[bornagain1981]

I added the holoviews module in setup file but Sphinx keep reporting "missing module error"

[bornagain1981]

Couple more requests after running the code. And the tests :-)

I added the tests :)

[mraspaud]

LGTM!

[djhoese]

Could we please get a follow up pull request that moves this functionality to a function in:

https://github.com/pytroll/satpy/blob/main/satpy/_scene_converters.py

This is a lot of code to add to an already bloated scene.py module. This _scene_converters.py module was created (admittedly after this PR was started but before it was merged) as a "dumping ground" for these types of conversions.