Add support for caching renders in Graphiti, and better support using etags and `stale?` in the controller #64

Job	Run time
Lint	22s
Tests - 2.6 \| Gemfile \| Appraisal: false	32s
Tests - 2.6 \| gemfiles/rails_5_2.gemfile \| Appraisal: true	32s
Tests - 2.6 \| gemfiles/rails_6.gemfile \| Appraisal: true	34s
Tests - 2.6 \| gemfiles/rails_5_2_graphiti_rails.gemfile \| Appraisal: true	33s
Tests - 2.6 \| gemfiles/rails_6_graphiti_rails.gemfile \| Appraisal: true	30s
Tests - 2.7 \| Gemfile \| Appraisal: false	28s
Tests - 2.7 \| gemfiles/rails_5_2.gemfile \| Appraisal: true	31s
Tests - 2.7 \| gemfiles/rails_6.gemfile \| Appraisal: true	31s
Tests - 2.7 \| gemfiles/rails_7.gemfile \| Appraisal: true	29s
Tests - 2.7 \| gemfiles/rails_5_2_graphiti_rails.gemfile \| Appraisal: true	40s
Tests - 2.7 \| gemfiles/rails_6_graphiti_rails.gemfile \| Appraisal: true	32s
Tests - 2.7 \| gemfiles/rails_7_graphiti_rails.gemfile \| Appraisal: true	34s
Tests - 3.0 \| Gemfile \| Appraisal: false	16s
Tests - 3.0 \| gemfiles/rails_6.gemfile \| Appraisal: true	17s
Tests - 3.0 \| gemfiles/rails_7.gemfile \| Appraisal: true	15s
Tests - 3.0 \| gemfiles/rails_6_graphiti_rails.gemfile \| Appraisal: true	16s
Tests - 3.0 \| gemfiles/rails_7_graphiti_rails.gemfile \| Appraisal: true	17s
Tests - 3.1 \| Gemfile \| Appraisal: false	14s
Tests - 3.1 \| gemfiles/rails_6.gemfile \| Appraisal: true	23s
Tests - 3.1 \| gemfiles/rails_7.gemfile \| Appraisal: true	17s
Tests - 3.1 \| gemfiles/rails_6_graphiti_rails.gemfile \| Appraisal: true	20s
Tests - 3.1 \| gemfiles/rails_7_graphiti_rails.gemfile \| Appraisal: true	16s
Tests - ruby-head \| Gemfile \| Appraisal: true	14s
Tests - ruby-head \| Gemfile \| Appraisal: false	13s
	10m 6s

Provide feedback