[pdal] write an in-memory array of points to a writer ... using Python bindings

[Michael Rosen]

Can we use the Python Bindings to create a LAS file from values we hold in
Memory?  In my case, I'm using the HDF Python library to read a .h5 file
and need to convert the results to LAS.

In the Writing with PDAL documentation
<https://www.pdal.io/tutorial/writing.html#writing>, Bradley Chambers shows
how to do this in C++ ... but it looks like we're missing some machinery to
do it via Python.

In the test for the Python Bindings
<https://github.com/PDAL/PDAL/blob/master/python/test/test_pipeline.py>, we
see how to write the output from a filter to an array ... but not the other
way around.

msr
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