build: Switch to maturin as build backend

This commit replaces the used build backend and configuration, as well
as the CI workflows, to use maturin instead of setuptools.

Author: Wuestengecko

.git_archival.txt

@@ -28,7 +28,7 @@ updates:
     commit-message:
       prefix: build(python)
   - package-ecosystem: cargo
-    directory: /
+    directory: /rust
     schedule:
       interval: weekly
       day: wednesday