feat: add basic HTTP, websocket functionality

- add ntex and serde as requirements
- add HTTP server with index/ and ws/ endpoints
- add websocket types and systems, basic Ping and GetTracks endpoints
- add serialize/deserialize support to models::Tracks
- add handle and get_tracks method to library
- clean up types.rs

src/models.rs

@@ -1,4 +1,5 @@
 use diesel::prelude::*;
+use serde::{Deserialize, Serialize};
 
 use crate::schema::{artists, collections, tracks};
 
@@ -22,7 +23,10 @@ pub struct Collection {
     pub display_name: String,
 }
 
-#[derive(Debug, Clone, Queryable, Selectable, Identifiable, Associations)]
+// TODO: make this more ergonomic (nested artist object instead of artist ID, etc)
+#[derive(
+    Debug, Clone, Queryable, Selectable, Identifiable, Associations, Serialize, Deserialize,
+)]
 #[diesel(table_name = tracks)]
 #[diesel(belongs_to(Artist, foreign_key = artist_id))]
 #[diesel(belongs_to(Collection, foreign_key = collection_id))]
@@ -68,4 +72,4 @@ pub struct NewTrack<'a> {
     pub genre: Option<&'a str>,
     pub track_datetime: Option<&'a str>,
     pub length_sec: i32,
-}
+}