⚰️ Remove: StreamType enum and StreamContext enum [#64]

Because the `Client::get_stream` method is removed.

src/client.rs

@@ -1144,73 +1144,6 @@ where
 pub mod stream {
     //! Features for streams.
 
-    /// Enum for the stream type.
-    pub enum StreamType {
-        /// 40 LINES
-        FortyLines,
-        /// BLITZ
-        Blitz,
-        /// Any
-        Any,
-        /// TETRA LEAGUE
-        League,
-    }
-
-    impl StreamType {
-        /// Converts to a `&str`.
-        ///
-        /// # Examples
-        ///
-        /// ```ignore
-        /// # use tetr_ch::client::stream::StreamType;
-        /// let forty_lines = StreamType::FortyLines;
-        /// let blitz = StreamType::Blitz;
-        /// let any = StreamType::Any;
-        /// let league = StreamType::League;
-        /// assert_eq!(forty_lines.as_str(), "40l");
-        /// assert_eq!(blitz.as_str(), "blitz");
-        /// assert_eq!(any.as_str(), "any");
-        /// assert_eq!(league.as_str(), "league");
-        /// ```
-        pub(crate) fn as_str(&self) -> &str {
-            match self {
-                StreamType::FortyLines => "40l",
-                StreamType::Blitz => "blitz",
-                StreamType::Any => "any",
-                StreamType::League => "league",
-            }
-        }
-    }
-
-    /// Enum for the stream context.
-    pub enum StreamContext {
-        Global,
-        UserBest,
-        UserRecent,
-    }
-
-    impl StreamContext {
-        /// Converts to a `&str`.
-        ///
-        /// # Examples
-        ///
-        /// ```ignore
-        /// # use tetr_ch::client::stream::StreamContext;
-        /// let global = StreamContext::Global;
-        /// let user_best = StreamContext::UserBest;
-        /// let user_recent = StreamContext::UserRecent;
-        /// assert_eq!(global.as_str(), "global");
-        /// assert_eq!(user_best.as_str(), "user_best");
-        /// assert_eq!(user_recent.as_str(), "user_recent");
-        pub(crate) fn as_str(&self) -> &str {
-            match self {
-                StreamContext::Global => "global",
-                StreamContext::UserBest => "userbest",
-                StreamContext::UserRecent => "userrecent",
-            }
-        }
-    }
-
     /// The news subject.
     pub enum NewsStream {
         /// Global news.