chore: Redirect to prev url on login

[geido]

Description

Adds the ability to redirect to a URL as defined in the query params next_url after login.

ADDITIONAL INFORMATION

• Has associated issue: redirection to original url after login (Superset) #412
• Is CRUD MVC related.
• Is Auth, RBAC security related.
• Changes the security db schema.
• Introduces new feature
• Removes existing feature

[dpgaspar]

can you add it to AuthOIDView also

[codecov]

Codecov Report

Merging #1747 (c83c25c) into master (071e66b) will decrease coverage by 0.04%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #1747      +/-   ##
==========================================
- Coverage   76.80%   76.76%   -0.05%     
==========================================
  Files          56       56              
  Lines        8115     8124       +9     
==========================================
+ Hits         6233     6236       +3     
- Misses       1882     1888       +6     

Flag	Coverage Δ
python	76.76% <33.33%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
flask_appbuilder/security/views.py	62.16% <33.33%> (-0.72%)	⬇️

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