feat: selective sync (#3877)

[kshamajain99]

Signed-off-by: kshamajain99 kshamajain99@gmail.com

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issue: #3877
gitops-engine changes: argoproj/gitops-engine#213

This feature applies only out-of-sync resources when ApplyOutOfSync=true option is provided by user.

Test performed:

Scenario: For an application with 10 deployments and 1 svc, deleting svc and syncing entire application (performing same action)

With ApplyOutOfSync=true enabled

INFO[0040] sync/terminate complete              application=guestbook duration=507.61639ms syncId=00001-NPWVT

Without ApplyOutOfSync=true enabled

INFO[0114] sync/terminate complete              application=guestbook duration=1.983608856s syncId=00002-orWNj

[mayzhang2000]

go.mod needs to be updated once the change in gitops-engine is merged.

[alexmt]

LGTM. Merging after gitops engine reference is updated to argoproj/gitops-engine#213

[codecov-io]

Codecov Report

Merging #5347 (8c2be96) into master (00f53b5) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5347      +/-   ##
==========================================
- Coverage   41.06%   41.02%   -0.04%     
==========================================
  Files         136      136              
  Lines       18384    18510     +126     
==========================================
+ Hits         7549     7594      +45     
- Misses       9755     9832      +77     
- Partials     1080     1084       +4     

Impacted Files	Coverage Δ
controller/sync.go	67.47% <ø> (ø)
controller/state.go	69.64% <100.00%> (-5.65%)	⬇️
server/application/broadcaster.go	71.42% <0.00%> (-7.15%)	⬇️
server/application/application.go	28.37% <0.00%> (-0.33%)	⬇️
controller/appcontroller.go	53.57% <0.00%> (-0.12%)	⬇️
pkg/apis/application/v1alpha1/types.go	56.37% <0.00%> (-0.07%)	⬇️
server/session/ratelimiter.go	100.00% <0.00%> (ø)
server/account/account.go	69.16% <0.00%> (+0.74%)	⬆️
cmd/argocd-util/commands/apps.go	38.91% <0.00%> (+1.34%)	⬆️
... and 1 more

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