Cache

[Spuds]

Adds redis cache support (2) ways

One uses the phpredis pecl extension
One uses the predis\predis php library

Its up the the admin (site and server) how they want to install those. pecl is straight foward, and in the PR the predis would have to be placed in the ext directory. I think moving to full composer vendor directory support is the direction we should move and drop the ext directory or leave it there just for addons not the core.

Still need to add tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.59%. Comparing base (da9ee2e) to head (adfb03c).
Report is 1 commits behind head on development.

Additional details and impacted files

@@                Coverage Diff                @@
##             development    #3801      +/-   ##
=================================================
+ Coverage          43.49%   43.59%   +0.10%     
- Complexity         13955    14045      +90     
=================================================
  Files                348      350       +2     
  Lines              74966    75199     +233     
=================================================
+ Hits               32606    32785     +179     
- Misses             42360    42414      +54     

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