chore: vendor nucleo-ext + fork, so we can depend on our changes properly (#3284)

We cannot publish to crates.io without specifying a version, and we
cannot do that without properly forking nucleo. We're shipping
atuin-nucleo, but will likely drop this if we can get our changes
upstream. This is highlighted in the README + manifest, and the original
author is still included.

Originally forked here: https://github.com/atuinsh/nucleo-ext

cc @BinaryMuse - this should just be a vendor + restructure, but would
appreciate the sanity check

## Checks
- [ ] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [ ] I have checked that there are no existing pull requests for the
same thing

1 files changed, 14 insertions, 0 deletions

diff --git a/crates/atuin-nucleo/matcher/src/debug.rs b/crates/atuin-nucleo/matcher/src/debug.rs
new file mode 100644
index 00000000..b8369f32
--- /dev/null
+++ b/crates/atuin-nucleo/matcher/src/debug.rs
@@ -0,0 +1,14 @@
+use crate::matrix::{MatrixCell, ScoreCell};
+use std::fmt::{Debug, Formatter, Result};
+
+impl Debug for ScoreCell {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+        write!(f, "({}, {})", self.score, self.matched)
+    }
+}
+
+impl Debug for MatrixCell {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+        write!(f, "({}, {})", (self.0 & 1) != 0, (self.0 & 2) != 0)
+    }
+}