Address review comments

android-core/src/main/kotlin/com/mparticle/internal/BatchId.kt

@@ -3,14 +3,10 @@ package com.mparticle.internal
 import com.mparticle.internal.database.services.MessageService.ReadyMessage
 
 class BatchId {
-    var mpid: Long
-        get() = field
+    val mpid: Long
     var sessionId: String?
-        get() = field
     var dataplanId: String?
-        get() = field
     var dataplanVersion: Int?
-        get() = field
 
     constructor(mpid: Long, sessionId: String?, dataplanId: String?, dataplanVersion: Int?) {
         this.mpid = mpid
@@ -25,24 +21,4 @@ class BatchId {
         dataplanId = readyMessage.dataplanId
         dataplanVersion = readyMessage.dataplanVersion
     }
-
-    override fun equals(obj: Any?): Boolean {
-        if (obj !is BatchId) {
-            return false
-        }
-        for (i in 0 until fields().size) {
-            if (!MPUtility.isEqual(fields()[i], obj.fields()[i])) {
-                return false
-            }
-        }
-        return true
-    }
-
-    override fun hashCode(): Int {
-        return fields().contentHashCode()
-    }
-
-    private fun fields(): Array<Any?> {
-        return arrayOf(mpid, sessionId, dataplanId, dataplanVersion)
-    }
 }