Remove Int wrapper type from parser (#7577)

## Summary

This is only used for the `level` field in relative imports (e.g., `from
..foo import bar`). It seems unnecessary to use a wrapper here, so this
PR changes to a `u32` directly.

crates/ruff_python_ast/src/comparable.rs

@@ -1161,7 +1161,7 @@ pub struct StmtImport<'a> {
 pub struct StmtImportFrom<'a> {
     module: Option<&'a str>,
     names: Vec<ComparableAlias<'a>>,
-    level: Option<ast::Int>,
+    level: Option<u32>,
 }
 
 #[derive(Debug, PartialEq, Eq, Hash)]

crates/ruff_python_ast/src/nodes.rs

@@ -466,7 +466,7 @@ pub struct StmtImportFrom {
     pub range: TextRange,
     pub module: Option<Identifier>,
     pub names: Vec<Alias>,
-    pub level: Option<Int>,
+    pub level: Option<u32>,
 }
 
 impl From<StmtImportFrom> for Stmt {
@@ -2578,35 +2578,6 @@ impl Ranged for Identifier {
     }
 }
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
-pub struct Int(u32);
-
-impl Int {
-    pub fn new(i: u32) -> Self {
-        Self(i)
-    }
-    pub fn to_u32(&self) -> u32 {
-        self.0
-    }
-    pub fn to_usize(&self) -> usize {
-        self.0 as _
-    }
-}
-
-impl std::cmp::PartialEq<u32> for Int {
-    #[inline]
-    fn eq(&self, other: &u32) -> bool {
-        self.0 == *other
-    }
-}
-
-impl std::cmp::PartialEq<usize> for Int {
-    #[inline]
-    fn eq(&self, other: &usize) -> bool {
-        self.0 as usize == *other
-    }
-}
-
 #[derive(Clone, Debug, PartialEq, is_macro::Is)]
 pub enum Constant {
     None,