[Feat] add sleep plugin

[machichima]

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Why are the changes needed?

What changes were proposed in this pull request?

How was this patch tested?

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• added: For new features.
• changed: For changes in existing functionality.
• deprecated: For soon-to-be-removed features.
• removed: For features being removed.
• fixed: For any bug fixed.
• security: In case of vulnerabilities

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• I updated the documentation accordingly.
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[codecov]

Codecov Report

❌ Patch coverage is 62.02532% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.04%. Comparing base (2d13c8f) to head (c6623ea).
⚠️ Report is 22 commits behind head on master.

Files with missing lines	Patch %	Lines
flyteplugins/go/tasks/plugins/core/sleep/plugin.go	62.02%	20 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7579      +/-   ##
==========================================
+ Coverage   56.97%   57.04%   +0.06%     
==========================================
  Files         931      932       +1     
  Lines       58299    58464     +165     
==========================================
+ Hits        33216    33348     +132     
- Misses      22024    22045      +21     
- Partials     3059     3071      +12     

Flag	Coverage Δ
unittests-datacatalog	53.51% <ø> (ø)
unittests-flyteadmin	53.15% <ø> (+<0.01%)	⬆️
unittests-flytecopilot	43.06% <ø> (ø)
unittests-flytectl	64.09% <ø> (ø)
unittests-flyteidl	75.71% <ø> (ø)
unittests-flyteplugins	60.37% <62.02%> (+0.13%)	⬆️
unittests-flytepropeller	53.78% <ø> (+0.06%)	⬆️
unittests-flytestdlib	62.76% <ø> (+0.15%)	⬆️

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