[refurb] Implement repeated-append rule (FURB113) (#6702)

## Summary

As an initial effort with replicating `refurb` rules (#1348 ), this PR
adds support for
[FURB113](https://github.com/dosisod/refurb/blob/master/refurb/checks/builtin/list_extend.py)
and adds a new category of checks.

## Test Plan

I included a new test + checked that all other tests pass.

crates/ruff_python_semantic/src/definition.rs

@@ -117,7 +117,7 @@ impl Ranged for Member<'_> {
 }
 
 /// A definition within a Python program.
-#[derive(Debug)]
+#[derive(Debug, is_macro::Is)]
 pub enum Definition<'a> {
     Module(Module<'a>),
     Member(Member<'a>),