Set rest frequency in moment generator

[pford]

Description

• What is implemented or fixed? Mention the linked issue(s), if any.
  Closes [enhancement] support setting a new RESTFRQ for moment image generation #1385

• How does this PR solve the issue? Give a brief summary.
  Set MomentRequest rest frequency in MomentGenerator image coordinate system, then restore image rest freq after moment images created.

• Are there any companion PRs (frontend, protobuf)?
  Kuahchou/2396 new RESTFQ for moment carta-frontend#2404 + Add rest frequency to moment request carta-protobuf#98

• Is there anything else that testers should know (e.g. exactly how to reproduce the issue)?
  Rest frequency will be added to Moment dialog in frontend.

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 minor version bumped / protobuf version not bumped
• added reviewers and assignee
• GitHub Project estimate added

[kswang1029]

@pford this looks good to be a formal PR.

[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	83%	✔
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	38%	❌
Summary	46% (8641 / 18973)	➖