Sends histogram data for image rendering only when the channel is changed

[markccchiang]

Description

• What is implemented or fixed? Mention the linked issue(s), if any. Closes #1266.

• How does this PR solve the issue? Give a brief summary. The backend only sends histogram data for the image rendering only when the channel is changed. There are also a few changes to clean up the codes.

• Are there any companion PRs (frontend, protobuf)? No.

• Is there anything else that testers should know (e.g. exactly how to reproduce the issue)? The duplicated histogram data for the image region should be gone now.

Checklist

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

[acdo2002]

@markccchiang I have confirmed that the duplicated REGION_HISTOGRAM_DATA (the first one that is same to the original REGION_HISTOGRAM_DATA returned from OPEN_FILE request) problem has been solved. Now the ICD flow is [2023-05-18 08:43:54.288] [CARTA] [debug] [protocol] ==> REGION_HISTOGRAM_DATA [2023-05-18 08:43:55.867] [CARTA] [debug] [protocol] <== SET_HISTOGRAM_REQUIREMENTS Which is what we expect to.

The ICD test design has been updated!

[acdo2002]

@markccchiang I found big regression problems in this PR. ICD-RxJS failed on most PV related tests (7 tests), Moment related tests (5 tests), and Image fitting tests (3 tests). They are all lack "RegionHistogramData"

1. PV related dev ICD message flows should like

However your PR branch has NO "RegionHistogramData" and weird RasterTile Image

2. Moment related dev ICD message flows should like

   Once the frontend request 13 moment images, the backend should returned 13 "RegionHistogramData"

However your PR branch has NO "RegionHistogramData" and weird RasterTile Image

3. Image Fitting - show residual and model image dev ICD message flows should like

   There should has two "RegionHistogramData" for one residual image and one model image.

However your PR branch has NO "RegionHistogramData" and weird RasterTile Image

And you can see in your PR, the bottom left "Render Configuration" there is no plots (i.e. no RegionHistogramData information)

[github-actions[bot]]

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	49%	➖
Summary	38% (6902 / 18257)	❌