feat: Add 'get' command for retrieving and displaying applied resources

[siyul-park]

Changes Made

• Introduce a new get command to retrieve and display applied resources.
• Enhance the command's description for improved clarity and natural language.
• Refactor and modularize the existing code for better maintainability.

./uniflow get
 ID                          KIND    NAMESPACE  NAME    LINKS                                
 01HH8WSZC9RPTCCDQ9HDQ1TFFB  http    default    http    map[out:[map[name:router port:in]]]  
 01HH8WSZC9RPTCCDQ9HFEEQAYH  router  default    router  map[out[0]:[map[name:http port:in]]] 

Related Issues

Additional Information

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (8a6d42f) 63.82% compared to head (a40bdcd) 63.91%.

Files	Patch %	Lines
cmd/uniflow/get/cmd.go	61.22%	13 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   63.82%   63.91%   +0.08%     
==========================================
  Files          78       79       +1     
  Lines        6557     6606      +49     
==========================================
+ Hits         4185     4222      +37     
- Misses       1825     1830       +5     
- Partials      547      554       +7     

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[Seungwoo-Yu]

LGTM