Enhancement: Implement ChainNormalizer

[localheinz]

This PR

• implements a ChainNormalizer

[codecov]

Codecov Report

Merging #9 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master     #9   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity       21     26    +5     
=======================================
  Files             5      6    +1     
  Lines            50     60   +10     
=======================================
+ Hits             50     60   +10

Impacted Files	Coverage Δ	Complexity Δ
src/ChainNormalizer.php	100% <100%> (ø)	5 <5> (?)

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