pybind: Add S2Point bindings

[deustis]

Initial Bazel configuration for Pybind11 and S2Point bindings.
#522

The S2 Geometry library is transitioning from SWIG-based bindings to pybind11-based bindings.

During this migration:

• SWIG bindings (s2geometry): The current production bindings, built with CMake. Use import s2geometry to access these.
• pybind11 bindings (s2geometry_pybind): The new bindings under development, built with Bazel. Use import s2geometry_pybind to access these.

Once the pybind11 bindings are feature-complete and stable, the SWIG bindings will be deprecated and the pybind11 package will be renamed to s2geometry to become the primary Python API.

This PR adds Bazel configuration for building and testing the bindings on the local toolchain. For distribution we'll need to generate a wheel for compatibility with different OS and python versions.

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[jmr]

Looks like a good start. I'll have a closer look tomorrow.

How much are you planning on wrapping?

[deustis]

Looks like a good start. I'll have a closer look tomorrow.

Great!

How much are you planning on wrapping?

For my purposes I mainly need S2Cell and its dependencies. But I'm happy to do more to get this to whatever you would consider a viable MVP. Open to suggestions there?

[deustis]

@jmr, I made most of the changes you suggested. Let me know what you prefer for the directory layout and how to organize the python modules and I'll make those changes as well.

[deustis]

@jmr, friendly ping? I'm looking for feedback on the directory layout and python modules (see above).

[deustis]

@jmr, I've flattened the directories and responded to your other comments. This should be ready for another round!

(Still waiting on the lawyers to sign that CLA...)

[jmr]

Looks good modulo the two new comments/questions.

Oh, also add the CONTRIBUTORS stuff here.

[deustis]

Oh, also add the CONTRIBUTORS stuff here.

Done!

[deustis]

@jmr, I've made those changes. I also squashed all the commits to use my corp email from the CONTRIBUTORS files.

[jmr]

If I "squash and merge", it's only letting me use the noreply@github address. I assume you want the address from https://github.com/deustis/s2geometry/commit/f09da0646a6844c71441a1c73f5c4a433bd12fc6.patch.

Can you expand the commit message a bit? Here's what I had, feel free to change it.

pybind: Add S2Point bindings (#524)

Add pybind11 bindings for S2Point and bazel config.

This is the first step towards https://github.com/google/s2geometry/issues/522
(pybind11 wrapper)

I think then I can "rebase and merge".

[deustis]

I've updated the commit description!

For the email address, I don't have a strong preference. I believe the CLA is satisfied either way. If you can carry through the aurora.tech email that would be slightly preferable but if not the noreply email address is okay too.

[jmr]

Thanks!