feat: early interface with Python

src/arbitrary/map.rs

@@ -0,0 +1,16 @@
+use std::collections::BTreeMap;
+
+use pyo3::prelude::*;
+
+use super::{arbitrary::Arbitrary, map_key::MapKey};
+
+#[derive(Debug, Clone, derive_more::From, derive_more::Into)]
+pub struct Map(pub BTreeMap<MapKey, Arbitrary>);
+
+impl<'py> FromPyObject<'py> for Map {
+    fn extract_bound(ob: &Bound<'py, PyAny>) -> PyResult<Self> {
+        let inner: BTreeMap<MapKey, Arbitrary> = ob.extract()?;
+
+        Ok(Self(inner))
+    }
+}