fix: Added the ability to support the at symbol (@) in file names

[wasabeef]

What does this change?

• Support the at symbol (@) in file names
  Support the at symbol (@) in file names. #134

[wasabeef]

Memo: The test fails until it is released because dependency_overrides can't use when ci build.

[codecov]

Codecov Report

Merging #135 (f1b8628) into main (a343a62) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #135   +/-   ##
=======================================
  Coverage   98.87%   98.87%           
=======================================
  Files          17       17           
  Lines         531      531           
=======================================
  Hits          525      525           
  Misses          6        6           

Impacted Files	Coverage Δ
packages/core/lib/utils/string.dart	100.00% <ø> (ø)

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