[GH-1996]Create object of S2Geography, and implement PoinGeography with its en…

[ZhuochengShang]

…coder/decoder

Did you read the Contributor Guide?

• Yes, I have read the Contributor Rules and Contributor Development Guide

• No, I haven't read it.

Is this PR related to a ticket?

• Yes, and the PR name follows the format [SEDONA-XXX] my subject.

• Yes, and the PR name follows the format [GH-XXX] my subject.

• No:

  • this is a documentation update. The PR name follows the format [DOCS] my subject
  • this is a CI update. The PR name follows the format [CI] my subject

What changes were proposed in this PR?

How was this patch tested?

Did this PR include necessary documentation updates?

• Yes, I am adding a new API. I am using the current SNAPSHOT version number in vX.Y.Z format.
• Yes, I have updated the documentation.
• No, this PR does not affect any public API so no need to change the documentation.

[jiayuasu]

@ZhuochengShang great work. Please create a GitHub issue and link the PR to that issue using [GH-XXXX]

[jiayuasu]

Great work @ZhuochengShang . It is great to have a working PR that shows the progress. But when it is ready, we'd like to break it into a sequence of small PRs. This will make the review process easier.

[jiayuasu]

Please also update the title of this PR to [GH-XXXX] that links to the GitHub issue.

[paleolimbot]

Thank you for this work so far! Just a note that if you (or Kristin or Jia) run across anything that doesn't make sense or is sub-optimial in the C++ version of S2Geography to let me know!

[jiayuasu]

What is the status of this PR?

[paleolimbot]

Awesome!