Enhancement: Turn method on Format into named constructor on Indent

[localheinz]

This PR

• turns a method for sniffing an indent in Format into a named constructor on Indent

[codecov]

Codecov Report

Merging #94 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master    #94   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity      127    127           
=======================================
  Files            28     28           
  Lines           392    392           
=======================================
  Hits            392    392

Impacted Files	Coverage Δ	Complexity Δ
src/Format/Format.php	100% <100%> (ø)	17 <0> (-2)	⬇️
src/Format/Indent.php	100% <100%> (ø)	9 <2> (+2)	⬆️

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