Make redirect variable name configureable

[asgraf]

This patch makes redirect variable name configurable via:

$action->setConfig('redirectVar', 'new_value');

Default value of 'redirect_url' for backward compatibility

[codecov]

Codecov Report

Base: 88.84% // Head: 89.25% // Increases project coverage by +0.40% 🎉

Coverage data is based on head (d65004e) compared to base (77a7305).
Patch coverage: 55.55% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #686      +/-   ##
============================================
+ Coverage     88.84%   89.25%   +0.40%     
  Complexity      379      379              
============================================
  Files            36       36              
  Lines          1076     1182     +106     
============================================
+ Hits            956     1055      +99     
- Misses          120      127       +7     

Impacted Files	Coverage Δ
src/Traits/RedirectTrait.php	63.33% <55.55%> (+1.26%)	⬆️
src/Core/ProxyTrait.php	63.15% <0.00%> (-7.44%)	⬇️
src/Listener/RelatedModelsListener.php	66.21% <0.00%> (-3.49%)	⬇️
src/Action/AddAction.php	100.00% <0.00%> (ø)
src/Action/EditAction.php	100.00% <0.00%> (ø)
src/Action/Bulk/DeleteAction.php	100.00% <0.00%> (ø)
src/Error/Exception/ValidationException.php	100.00% <0.00%> (ø)
src/Listener/ApiListener.php	98.46% <0.00%> (+0.07%)	⬆️
src/Listener/ApiQueryLogListener.php	96.55% <0.00%> (+0.39%)	⬆️
src/Action/BaseAction.php	96.26% <0.00%> (+0.47%)	⬆️
... and 10 more

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