Typing Part 3.

[jwag956]

This adds types to the Security constructor and init_app. This required major refactoring of how initialization happened since prior to this
all arguments were added to kwargs (including default forms, config variables, etc) then set as attributes on the instance. Not easy to provide types for each one.
We remove all that, remove the _SecurityState class and concept.

Furthermore - in many places - we change from using _securyty.attr and use config_value("xxx").

Improve performance of config_value - no reason to create a dictonary every time - just query the key!

Add typing to more tests and views to help verify the types make sense.

Fix view responses - the types should be flask.ResponsValue - not Response

Fix 'within' and 'grace' typing - then can take floats.

closes: #140

[codecov]

Codecov Report

Merging #502 (c2b6c47) into master (e52eb16) will increase coverage by 0.15%.
The diff coverage is 99.57%.

@@            Coverage Diff             @@
##           master     #502      +/-   ##
==========================================
+ Coverage   97.87%   98.03%   +0.15%     
==========================================
  Files          25       25              
  Lines        3204     3252      +48     
==========================================
+ Hits         3136     3188      +52     
+ Misses         68       64       -4     

Impacted Files	Coverage Δ
flask_security/decorators.py	95.37% <ø> (ø)
flask_security/proxies.py	100.00% <ø> (ø)
flask_security/core.py	98.20% <99.42%> (+1.18%)	⬆️
flask_security/unified_signin.py	98.67% <100.00%> (+<0.01%)	⬆️
flask_security/utils.py	97.30% <100.00%> (+0.01%)	⬆️
flask_security/views.py	98.31% <100.00%> (+<0.01%)	⬆️

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