Fix: Remove IndentInterface

[localheinz]

This PR

• removes the IndentInterface

💁‍♂️ There's no need for a different implementation.

[codecov]

Codecov Report

Merging #89 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #89   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity      126    126           
=======================================
  Files            27     27           
  Lines           390    390           
=======================================
  Hits            390    390

Impacted Files	Coverage Δ	Complexity Δ
src/Format/Indent.php	100% <100%> (ø)	7 <5> (ø)	⬇️
src/IndentNormalizer.php	100% <100%> (ø)	3 <2> (ø)	⬇️
src/Format/Format.php	100% <100%> (ø)	21 <6> (ø)	⬇️

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