ENH: Add inplace kwarg to Geod.fwd and Geod.inv

[greglucas]

This adds the ability to reuse the arrays passed in and out of the geod functions, following the same idea as the Transformers. I noticed this while profiling some of Cartopy's code and we could potentially get some speedup over there from this. We spend a lot of time in _copytobuffer.

I'm not sure if you would want the inplace applied to all potential inputs (i.e. ind as well) or just the outputs. Seems best to make it all to avoid the copy if possible.

• Tests added
• Fully documented, including history.rst for all changes and api/*.rst for new API

[codecov]

Codecov Report

Merging #1201 (f571212) into main (c560046) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1201   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files          20       20           
  Lines        1791     1791           
=======================================
  Hits         1724     1724           
  Misses         67       67           

Impacted Files	Coverage Δ
pyproj/geod.py	97.38% <100.00%> (ø)

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[snowman2]

Looks good. Thanks 👍