Add sync id and tile count to raster tile messages

[pford]

Description

• What is implemented or fixed? Mention the linked issue(s), if any.
  Add sync_id to tile messages #1282
• How does this PR solve the issue? Give a brief summary.
  With multithreading, there could be overlapping RasterTileSync/RasterTileData messages. Adding an id and a count to these messages helps the frontend sort them out.
• Are there any companion PRs (frontend, protobuf)?
  frontend #2219, protobuf #87
• Is there anything else that testers should know (e.g. exactly how to reproduce the issue)?
  See frontend issue #1988
  Checklist

• changelog updated / no changelog update needed
• e2e test passing / added corresponding fix
• protobuf updated to the latest dev commit / no protobuf update needed
• added reviewers and assignee
• added ZenHub estimate, milestone, and release

[kswang1029]

the solution with sync_id works nicely as far as I can tell. No missing tiles after animation stopping, or during animation playback. Vector overlay is rendered properly during/after animating as well. 👍 Thanks @crocka and @pford.

[acdo2002]

Because adding the syncId for RASTER_TILE_DATA and RASTER_TILE_SYNC, the ICD tests need to be updated, please merge it after finishing the ICD tests (otherwise the daily monitor tests will failed). I will let everyone know when the tests are finish the updates.

[acdo2002]

I have updated the tests code PR that can be passed on MacOS11 with this backend PR (and corresponding protobuf).
Thanks for waiting!

[github-actions]

Package	Line Rate	Health
src.Cache	66%	➖
src.DataStream	52%	➖
src.FileList	67%	➖
src.Frame	50%	➖
src.HttpServer	43%	➖
src.ImageData	28%	❌
src.ImageFitter	89%	✔
src.ImageGenerators	44%	➖
src.ImageStats	76%	✔
src.Logger	44%	➖
src.Main	54%	➖
src.Region	18%	❌
src.Session	29%	❌
src.Table	52%	➖
src.ThreadingManager	87%	✔
src.Timer	85%	✔
src.Util	48%	➖
Summary	38% (7012 / 18558)	❌