refactor(symfony-string): extract symfony/string into the shirabe-symfony-string crate

Move `Symfony\Component\String` out of shirabe-external-packages and into
its own crate, so the path is `shirabe_symfony_string::ByteString`
instead of `shirabe_external_packages::symfony::string::ByteString`.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 0 insertions, 17 deletions

diff --git a/crates/shirabe-external-packages/src/symfony/string.rs b/crates/shirabe-external-packages/src/symfony/string.rs
deleted file mode 100644
index 139d726f..00000000
--- a/crates/shirabe-external-packages/src/symfony/string.rs
+++ /dev/null
@@ -1,17 +0,0 @@
-pub mod byte_string;
-pub mod code_point_string;
-pub mod unicode_string;
-
-pub use byte_string::*;
-pub use code_point_string::*;
-pub use unicode_string::*;
-
-/// Mirror of Symfony's `b()` helper function.
-pub fn b(string: &str) -> ByteString {
-    ByteString::new(string)
-}
-
-/// Mirror of Symfony's `u()` helper function.
-pub fn s(string: &str) -> UnicodeString {
-    UnicodeString::new(string)
-}