move core::pdu and core::state_res into core::matrix::

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/matrix/pdu/content.rs

@@ -0,0 +1,20 @@
+use serde::Deserialize;
+use serde_json::value::Value as JsonValue;
+
+use crate::{Result, err, implement};
+
+#[must_use]
+#[implement(super::Pdu)]
+pub fn get_content_as_value(&self) -> JsonValue {
+	self.get_content()
+		.expect("pdu content must be a valid JSON value")
+}
+
+#[implement(super::Pdu)]
+pub fn get_content<T>(&self) -> Result<T>
+where
+	T: for<'de> Deserialize<'de>,
+{
+	serde_json::from_str(self.content.get())
+		.map_err(|e| err!(Database("Failed to deserialize pdu content into type: {e}")))
+}