Apply perlimports to tests

[oalders]

• Add a perlimports.toml
• Apply perlimports to tests

[oalders]

I was just looking around for something in the internals and figured I'd see what perlimports came up with on the tests.

[codecov]

Codecov Report

Base: 83.04% // Head: 83.00% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (42bbe1c) compared to base (192540f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
- Coverage   83.04%   83.00%   -0.04%     
==========================================
  Files          82       82              
  Lines        1887     1883       -4     
  Branches      240      240              
==========================================
- Hits         1567     1563       -4     
  Misses        219      219              
  Partials      101      101              

Impacted Files	Coverage Δ
t/lib/TestHelper/Plugin/ReverseFoo.pm	100.00% <ø> (ø)
t/Basic.t	100.00% <100.00%> (ø)
t/Conf.t	100.00% <100.00%> (ø)
t/Git.t	100.00% <100.00%> (ø)
t/Plugin-CSSUnminifier.t	100.00% <100.00%> (ø)
t/Plugin-GenericTransformer.t	100.00% <100.00%> (ø)
t/Plugin-GenericValidator.t	100.00% <100.00%> (ø)
t/Plugin-JSBeautify.t	100.00% <100.00%> (ø)
t/Plugin-JSHint.t	100.00% <100.00%> (ø)
t/Plugin-JSLint.t	100.00% <100.00%> (ø)
... and 31 more

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[oalders]

Some of these Codecov diffs are wonky. 🤷🏻