feat: ability to suspend Work

[a7i]

What type of PR is this?

/kind feature

What this PR does / why we need it:
Ability to suspend work to ensure that changes are not being reconciled.

Which issue(s) this PR fixes:
Fixes #4688

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Ability to suspend Work to ensure that changes are not being reconciled.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 44.44444% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 52.73%. Comparing base (fdad87e) to head (bd027db).

Files	Patch %	Lines
pkg/detector/detector.go	0.00%	5 Missing ⚠️
pkg/controllers/binding/common.go	50.00%	2 Missing ⚠️
pkg/util/helper/work.go	0.00%	2 Missing ⚠️
...controllers/unifiedauth/unified_auth_controller.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4689      +/-   ##
==========================================
- Coverage   53.11%   52.73%   -0.39%     
==========================================
  Files         250      251       +1     
  Lines       20351    20523     +172     
==========================================
+ Hits        10810    10822      +12     
- Misses       8824     8980     +156     
- Partials      717      721       +4     

Flag	Coverage Δ
unittests	52.73% <44.44%> (-0.39%)	⬇️

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[chaunceyjiang]

suspend Work

We've always wanted to have this feature, but it seems to be put on hold for some reason.

@RainbowMango @CharlesQQ Do you all still remember?

[RainbowMango]

Yes exactly! @CharlesQQ proposed this about two years ago at #1567, but unfortunately, it has been delayed so much.
I was excited when @a7i talked about this feature at the community meeting this week, as we will have more use cases to help us build this feature.

What I expected from this feature is to build a practice for gray(or blue-green) release.

[CharlesQQ]

This pr only suspend work object, I think it't not enough; suspend field must be set in pp or resourceTemplate, and synced to work object.

[a7i]

@CharlesQQ would you be open to reviving your PRs?

[a7i]

replaced by #4838 (needed to remove / from the branch name due to golang/go#32955)