Calculate fitting results for beam deconvolved images

[markccchiang]

Description

• What is implemented or fixed? Mention the linked issue(s), if any.
  Implement Image fitting with beam deconvolved images #1236.

• How does this PR solve the issue? Give a brief summary.
  Create a class Deconvolver which converts the fitting results to beam deconvolved images. The convolution method is originally from the casacode.

• Are there any companion PRs (frontend, protobuf)?
  So far no. Question: do we need to create an image for fitting results with beam deconvolution? If so, we may need to modify the frontend and protobuf. We can choose to show both fitting PDF images w and w/o beam deconvolution or there is an option to show only one of them.

• Is there anything else that testers should know (e.g. exactly how to reproduce the issue)?
  When fitting with the image that has beam information, the fitting results with beam deconvolution will also shown like the following snapshot:

Checklist

• changelog updated / no changelog update needed
• e2e test passing / corresponding fix added / new e2e test created
• ICD test passing / corresponding fix added / new ICD test created
• protobuf updated to the latest dev commit / no protobuf update needed
• protobuf version bumped / protobuf version not bumped
• added reviewers and assignee
• added ZenHub estimate, milestone, and release

[github-actions]

Package	Line Rate	Health
src.Cache	72%	➖
src.DataStream	44%	➖
src.FileList	67%	➖
src.Frame	36%	❌
src.HttpServer	42%	➖
src.ImageData	28%	❌
src.ImageFitter	76%	✔
src.ImageGenerators	43%	➖
src.ImageStats	75%	✔
src.Logger	37%	❌
src.Main	52%	➖
src.Region	69%	➖
src.Session	4%	❌
src.Table	52%	➖
src.ThreadingManager	67%	➖
src.Timer	85%	✔
src.Util	40%	➖
Summary	46% (8874 / 19168)	➖