add /user/{uid} call on web module.

- add GetUserEvents.
- add /user/{uid} backends.

common/src/main/kotlin/space/mori/chzzk_bot/common/events/GetUserEvents.kt

@@ -0,0 +1,17 @@
+package space.mori.chzzk_bot.common.events
+
+enum class GetUserType(var value: Int) {
+    REQUEST(0),
+    RESPONSE(1),
+    NOTFOUND(2)
+}
+
+class GetUserEvents(
+    val type: GetUserType,
+    val uid: String?,
+    val nickname: String?,
+    val isStreamOn: Boolean?,
+    val avatarUrl: String?,
+): Event {
+    var TAG = javaClass.simpleName
+}