Make var-dump and var-export usable for non-arrays

[weitzman]

Also add simplifier for Drupal Entities

This works with this this PR and not without:

1. Simplifier: drush ev 'return \Drupal\user\Entity\User::load(1)' --format=yaml
2. var_dump/var_export: drush ev 'return \Drupal::keyValue("entity.definitions.installed")->get("user.entity_type")' --format=var_dump

Once this PR goes in, IMO we should change the Drush's default format in php:eval from var_export to var_dump (since it is colored and thus easier to read). Also we should bump the min version of consolidation/output-formatters

Overview

This pull request:

• [x] Fixes a bug
• [x] Adds a feature
• [ ] Breaks backwards compatibility
• [ ] Has tests that cover changes

[codecov[bot]]

Codecov Report

Merging #109 (0555735) into 4.x (33e140d) will increase coverage by 0.04%. The diff coverage is 100.00%.

:exclamation: Current head 0555735 differs from pull request most recent head 060da92. Consider uploading reports for the commit 060da92 to get more accurate results

@@             Coverage Diff              @@
##                4.x     #109      +/-   ##
============================================
+ Coverage     91.88%   91.93%   +0.04%     
- Complexity      526      530       +4     
============================================
  Files            50       50              
  Lines          1318     1326       +8     
============================================
+ Hits           1211     1219       +8     
  Misses          107      107              

Impacted Files	Coverage Δ
src/Formatters/VarDumpFormatter.php	92.30% <100.00%> (+3.41%)	:arrow_up:
src/Formatters/VarExportFormatter.php	100.00% <100.00%> (ø)

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