feat: Add ExtXPlaylistType support in M3U8 tags and builder

This commit introduces the `ExtXPlaylistType` tag to the M3U8 playlist parser, which provides mutability information about the playlist. It also updates the builder to support adding this tag, and includes a new Makefile for testing and linting with cargo.

Makefile

@@ -0,0 +1,3 @@
+check:
+	cargo test
+	cargo clippy --fix --allow-dirty --allow-staged

src/m3u8/playlist/builder.rs

@@ -260,4 +260,10 @@ impl PlaylistBuilder {
             Err(errors) => Err(errors),
         }
     }
+
+    /// Adds an `ExtXPlaylistType` tag.
+    pub fn playlist_type(mut self, playlist_type: String) -> Self {
+        self.tags.push(Tag::ExtXPlaylistType(playlist_type));
+        self
+    }
 }

src/m3u8/playlist/mod.rs

@@ -493,6 +493,19 @@ impl Playlist {
 
                     return Ok(Some(target_duration_tag));
                 }
+                "#EXT-X-PLAYLIST-TYPE" => {
+                    let attributes = parse_attributes(stripped)?;
+                    let playlist_type = attributes
+                        .get("PLAYLIST-TYPE")
+                        .ok_or("Missing PLAYLIST-TYPE attribute")?
+                        .clone();
+
+                    if playlist_type != "EVENT" && playlist_type != "VOD" {
+                        return Err("Invalid PLAYLIST-TYPE value".to_string());
+                    }
+
+                    return Ok(Some(Tag::ExtXPlaylistType(playlist_type)));
+                }
                 _ => {}
             }
         }
@@ -556,7 +569,7 @@ impl Playlist {
                         ));
                     }
                 }
-               
+
                 // if end_date.is_some_and(move |t| {t.is_empty()})  {
                 //     // Add checks for end_date format or validity as needed
                 // } else {

src/m3u8/tags.rs

@@ -8,6 +8,10 @@ pub enum Tag {
     ExtM3U,
     /// Specifies the version of the M3U8 playlist.
     ExtXVersion(u8),
+    /// The EXT-X-PLAYLIST-TYPE tag provides mutability information about the
+    //    Media Playlist file.  It applies to the entire Media Playlist file.
+    //    It is OPTIONAL.  Its format is:
+    ExtXPlaylistType(String),
     /// Represents a media segment with a duration and an optional title.
     ExtInf(f32, Option<String>),
     /// Indicates the target duration for media segments.
@@ -474,6 +478,10 @@ impl std::fmt::Display for Tag {
                 }
                 Ok(())
             }
+            Tag::ExtXPlaylistType(playlist_type) => {
+                write!(f, "#EXT-X-PLAYLIST-TYPE:{}", playlist_type)?;
+                Ok(())
+            }
         }
     }
 }