Generate separate laz files for difference surveys instead of merging into a single laz.

[lidar532]

In notebook 07_3DEP_Generate_Colorized_PointClouds.ipynb
when selecting an area with overlapping surveys, there needs to be a way to either place
each survey into a separate laz file, or a way to select only one of the surveys instead of
all surveys within the selection polygon.

My AOI_GCS was set to (Madeira Beach, FLA):

POLYGON ((
-82.805178 27.800081, 
-82.795567 27.807825, 
-82.778748 27.790666, 
-82.773428 27.780794, 
-82.784583 27.773049, 
-82.790247 27.788844, 
-82.803118 27.794766, 
-82.805178 27.800081
))

which has the following two surveys conducted 9 years apart, but get merged into the single
resulting laz file pointcloud_colorized.laz.

Points            Survey Name                               Data Source Url 
16,835,045,264    FL_Peninsular_Pinellas_2018               https://s3-us-west-2.amazonaws.com/usgs-lidar-public/FL_Peninsular_Pinellas_2018/ept.json  
 3,091,561,200    FL_PinellasCo_2007                        https://s3-us-west-2.amazonaws.com/usgs-lidar-public/FL_PinellasCo_2007/ept.json  

It would be very nice if both surveys were downloaded by the notebook and then named, or renamed, according to the names variable instead of just pointcloud_colorized.laz