Implement Kubernetes application configuration and deployment input structures

[Warashi]

What this PR does:

• add KubernetesApplicationSpec with minimal fields
• decode the application config in the DetermineVersions method and pass values to manifest loader

Why we need it:

We have to load application config to treat the kubernetes resources.

Which issue(s) this PR fixes:

Part of #4980

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 25.40%. Comparing base (669bbd2) to head (d258cdd).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...app/pipedv1/plugin/kubernetes/deployment/server.go	0.00%	12 Missing ⚠️
...pp/pipedv1/plugin/kubernetes/config/application.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5356      +/-   ##
==========================================
- Coverage   25.41%   25.40%   -0.01%     
==========================================
  Files         445      446       +1     
  Lines       47793    47807      +14     
==========================================
  Hits        12146    12146              
- Misses      34697    34711      +14     
  Partials      950      950              

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