[YouTube] Add utility data class to store client and device info

This new class, InnertubeClientRequestInfo, composed of two mutable
subclasses, ClientInfo and DeviceInfo, allows to store client and
device info in a better way, without requiring to pass more than 10
method parameters like in YoutubeStreamHelper currently.

Mutability has been added in order to allow changing some fields
easily, especially visitorData.

Author: AudricV

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/InnertubeClientRequestInfo.java

@@ -0,0 +1,73 @@
+package org.schabi.newpipe.extractor.services.youtube;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+public final class InnertubeClientRequestInfo {
+
+    @Nonnull
+    public ClientInfo clientInfo;
+    @Nonnull
+    public DeviceInfo deviceInfo;
+
+    public static final class ClientInfo {
+
+        @Nonnull
+        public String clientName;
+        @Nonnull
+        public String clientVersion;
+        @Nonnull
+        public String clientScreen;
+        @Nullable
+        public String clientId;
+        @Nullable
+        public String visitorData;
+
+        public ClientInfo(@Nonnull final String clientName,
+                          @Nonnull final String clientVersion,
+                          @Nonnull final String clientScreen,
+                          @Nullable final String clientId,
+                          @Nullable final String visitorData) {
+            this.clientName = clientName;
+            this.clientVersion = clientVersion;
+            this.clientScreen = clientScreen;
+            this.clientId = clientId;
+            this.visitorData = visitorData;
+        }
+    }
+
+    public static final class DeviceInfo {
+
+        @Nonnull
+        public String platform;
+        @Nullable
+        public String deviceMake;
+        @Nullable
+        public String deviceModel;
+        @Nullable
+        public String osName;
+        @Nullable
+        public String osVersion;
+        public int androidSdkVersion;
+
+        public DeviceInfo(@Nonnull final String platform,
+                          @Nullable final String deviceMake,
+                          @Nullable final String deviceModel,
+                          @Nullable final String osName,
+                          @Nullable final String osVersion,
+                          final int androidSdkVersion) {
+            this.platform = platform;
+            this.deviceMake = deviceMake;
+            this.deviceModel = deviceModel;
+            this.osName = osName;
+            this.osVersion = osVersion;
+            this.androidSdkVersion = androidSdkVersion;
+        }
+    }
+
+    public InnertubeClientRequestInfo(@Nonnull final ClientInfo clientInfo,
+                                      @Nonnull final DeviceInfo deviceInfo) {
+        this.clientInfo = clientInfo;
+        this.deviceInfo = deviceInfo;
+    }
+}