feat: add new timeLenghtSeconds property to YTVideo

Author: b5i

Sources/YouTubeKit/BaseStructs/YTVideo.swift

@@ -171,6 +171,14 @@ public struct YTVideo: YTSearchResult, YouTubeVideo, Codable, Sendable {
     /// Can be `live` instead of `ab:cd` if the video is a livestream.
     public var timeLength: String?
 
+    /// Length in seconds of the video, extracted from ``timeLength``.
+    public var timeLenghtSeconds: Int? {
+        if let timeLength {
+            return Self.timeStringToSeconds(timeLength)
+        }
+        return nil
+    }
+    
     /// Array of thumbnails.
     ///
     /// Usually sorted by resolution, from low to high.

Sources/YouTubeKit/YouTubeResponseTypes/VideoInfos/VideoInfosResponse.swift

@@ -90,6 +90,8 @@ public struct VideoInfosResponse: YouTubeResponse {
     public var aspectRatio: Double?
 
     /// The start time of the video in seconds, represents the time that was already partially watched or that the "t" parameter is set in the video URL. Currently disabled because we can't make VideoInfosResponse requests with cookies.
+    ///
+    /// - Note: This property is also available on ``YTVideo/startTime``, please use this value.
     //public var startTime: Int? = nil
 
     /// Array of formats used to download the video, they usually contain both audio and video data and the download speed is higher than the ``VideoInfosResponse/downloadFormats``.