Make explorer geo more optimized

[ahuang11]

1. Batch call watchers so the loading symbol doesn't flicker (just tabbed everything over)
2. If scatter/line, swap to points/path
3. Projection doesn't always seem to be provided, so use crs instead

[maximlt]

Ah in fact there are two failing tests:

FAILED hvplot/tests/testui.py::test_explorer_geo_revise_kind[kind_tuple0] - TypeError: Constant parameter 'geo' cannot be modified
FAILED hvplot/tests/testui.py::test_explorer_geo_revise_kind[kind_tuple1] - TypeError: Constant parameter 'geo' cannot be modified

[ahuang11]

New test failure; prob should handle in a separate PR.
AttributeError: The geopandas.dataset has been deprecated and was removed in GeoPandas 1.0. You can get the original 'naturalearth_cities' data from [https://www.naturalearthdata.com/downloads/110m-cultural-vectors/.](https://www.naturalearthdata.com/downloads/110m-cultural-vectors/)

[codecov]

Codecov Report

Attention: Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.42%. Comparing base (6c96c7e) to head (e539fe6).
Report is 6 commits behind head on main.

Files	Patch %	Lines
hvplot/ui.py	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1353      +/-   ##
==========================================
+ Coverage   87.39%   88.42%   +1.03%     
==========================================
  Files          50       50              
  Lines        7490     7372     -118     
==========================================
- Hits         6546     6519      -27     
+ Misses        944      853      -91     

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