feat(saas): support to configure the redirection url for site after login/signup

[tanmoysrt]

Related #2281

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 39.79%. Comparing base (656e9fa) to head (2cbd188).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
press/saas/doctype/product_trial/product_trial.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2302      +/-   ##
==========================================
- Coverage   39.80%   39.79%   -0.01%     
==========================================
  Files         373      373              
  Lines       28380    28382       +2     
==========================================
  Hits        11296    11296              
- Misses      17084    17086       +2     

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