change add_raster backend for Localtileserver

[12rambau]

change add_raster backend for Localtileserver. It's faster and avoid the version deprecation from xarray_leaflet
Fix #496

[codecov]

Codecov Report

Merging #559 (e35d346) into main (054d117) will increase coverage by 0.75%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##             main     #559      +/-   ##
==========================================
+ Coverage   91.30%   92.06%   +0.75%     
==========================================
  Files          36       36              
  Lines        3463     3728     +265     
==========================================
+ Hits         3162     3432     +270     
+ Misses        301      296       -5     

Impacted Files	Coverage Δ
sepal_ui/mapping/value_inspector.py	88.99% <50.00%> (+0.41%)	⬆️
sepal_ui/mapping/sepal_map.py	90.93% <100.00%> (+1.90%)	⬆️
sepal_ui/conf.py	100.00% <0.00%> (ø)
sepal_ui/aoi/aoi_tile.py	100.00% <0.00%> (ø)
sepal_ui/mapping/layer.py	100.00% <0.00%> (ø)
sepal_ui/frontend/styles.py	100.00% <0.00%> (ø)
sepal_ui/sepalwidgets/btn.py	100.00% <0.00%> (ø)
sepal_ui/sepalwidgets/tile.py	100.00% <0.00%> (ø)
sepal_ui/mapping/aoi_control.py	100.00% <0.00%> (ø)
sepal_ui/sepalwidgets/inputs.py	100.00% <0.00%> (ø)
... and 24 more

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