Added new login flow. Respect domain flag on auth0 login command.

[duedares-rvj]

New improved login flow.
When domain flag is passed along with --no-input during auth0 login, it is interpreted as a user-flow. And hence pre-set the tenant while performing the browser based login.

The evaluation matrix of the flow is mentioned here:

🔧 Changes

1. Added new flow to determine user-flow or machine-flow based on the initial cli input. (Handle params like --no-input)
2. If the evaluation cannot be made, prompt user for login type.
3. Added domain value evaluation function ensuring it's auth.com domain.
4. Relevant unit test cases added.

Eg. User could use below for user-login:
auth0 login --domain <tenant domain> --no-input

📚 References

This addresses a feature request as suggest in:
#1000

🔬 Testing

Required test cases added under login_test.go which is consumed by make commands. No additional steps required.

📝 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 41.97531% with 47 lines in your changes missing coverage. Please review.

Project coverage is 72.14%. Comparing base (f5c05e5) to head (c4883bd).

Files	Patch %	Lines
internal/cli/login.go	40.78%	42 Missing and 3 partials ⚠️
internal/cli/cli.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1038      +/-   ##
==========================================
- Coverage   72.34%   72.14%   -0.21%     
==========================================
  Files          94       94              
  Lines       12781    12839      +58     
==========================================
+ Hits         9247     9263      +16     
- Misses       2984     3024      +40     
- Partials      550      552       +2     

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[developerkunal]

Changes LGTM.