Move walkSourceFiles from ioLegacy to FileAlg

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #250 into master will increase coverage by 0.07%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #250      +/-   ##
==========================================
+ Coverage   44.81%   44.88%   +0.07%     
==========================================
  Files          55       55              
  Lines         627      626       -1     
  Branches       26       32       +6     
==========================================
  Hits          281      281              
+ Misses        346      345       -1

Impacted Files	Coverage Δ
.../main/scala/org/scalasteward/core/io/FileAlg.scala	5.55% <0%> (-1.12%)	⬇️
.../main/scala/org/scalasteward/core/io/package.scala	0% <0%> (ø)	⬆️
...rc/main/scala/org/scalasteward/core/ioLegacy.scala	0% <0%> (ø)	⬆️

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