feat: add login command

[Codelax]

Close #3881

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 48.79518% with 85 lines in your changes missing coverage. Please review.

Project coverage is 69.34%. Comparing base (5bf53e0) to head (83727cd).
Report is 216 commits behind head on master.

Files	Patch %	Lines
internal/namespaces/login/login.go	28.75%	56 Missing and 1 partial ⚠️
...ternal/namespaces/login/webcallback/webcallback.go	65.75%	17 Missing and 8 partials ⚠️
internal/namespaces/login/webcallback/options.go	0.00%	3 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (83727cd). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (83727cd)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4043      +/-   ##
==========================================
- Coverage   75.45%   69.34%   -6.11%     
==========================================
  Files         202      295      +93     
  Lines       44323    55830   +11507     
==========================================
+ Hits        33444    38717    +5273     
- Misses       9653    15525    +5872     
- Partials     1226     1588     +362     

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