[pdal] variable argument names

[Norman Barker]

Hi,

when configuring a pipeline stage we can add named arguments to the plugin,
e.g. TileDBWriter we can set a `compression` property.

How would I define a map of properties, e.g. I have a named property called
compression and within that I have a map (json object) of the compression
type per attribute name? Currently ProgramArgs supports lists but not maps.

I can hack something for review, but I thought I would ask first for ideas.

Norman
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