Support flags to configure the rendering-mode, prompt, screen and settings-file

[ramya18101]

Support flags in ul customize command

🔧 Changes

📚 References

🔬 Testing

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 22.66667% with 58 lines in your changes missing coverage. Please review.

Project coverage is 70.38%. Comparing base (15ff967) to head (d03f0b8).

Files with missing lines	Patch %	Lines
internal/cli/universal_login_customize.go	22.53%	55 Missing ⚠️
internal/iostream/iostream.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1111      +/-   ##
==========================================
+ Coverage   70.32%   70.38%   +0.06%     
==========================================
  Files          94       94              
  Lines       13273    13284      +11     
==========================================
+ Hits         9334     9350      +16     
+ Misses       3394     3388       -6     
- Partials      545      546       +1     

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