manage GIL acquisition when doing things inside of pdal::plang #3
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We want to be sanitary with the GIL so that we can release it in the PDAL Python extension. One area where that's really important is the log/redirect stuff this package provides. This PR implements pybind11's simplified
gil_scoped_acquireandgil_scoped_releaseclasses that handle management of the state, and then uses these to protect various calls where we need it.