Add empty methods which need for implementing the k8s plugin with the SDK

[ffjlabo]

What this PR does:

as title.
I plan to rewrite it with SDK as follow.

• implement the current logic with SDK into struct sdkPlugin.
• Replace current struct plugin after implementing all methods which need for the interface DeploymentPlugin.

Why we need it:

We want to rewrite plugin by using SDK while keeping the current k8s plugin work.
Also, I want to rewrite it before implementing multi cluster plugin.

Which issue(s) this PR fixes:

Part of #4980 #5006

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 21 lines in your changes missing coverage. Please review.

Project coverage is 26.25%. Comparing base (c1a62c5) to head (914cf2c).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/app/pipedv1/plugin/kubernetes/plugin.go	0.00%	16 Missing ⚠️
pkg/app/pipedv1/plugin/kubernetes/main.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5602      +/-   ##
==========================================
- Coverage   26.27%   26.25%   -0.02%     
==========================================
  Files         474      474              
  Lines       50475    50496      +21     
==========================================
- Hits        13263    13259       -4     
- Misses      36150    36174      +24     
- Partials     1062     1063       +1     

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[t-kikuc]

let's update it to like 'kubernetes-multicluster' later

[ffjlabo]

This is for rewriting kubernetes plugin. So I think the plugin name is correct.