Add OkPacket interface for inserts, updates, and deletes (#43938)

* add OkPacket interface for inserts, updates, and deletes

* revert OkPacket member type, complete fields on OkPacket interface

Co-authored-by: Sanders DeNardi <sdenardi@summusglobal.com>

types/mysql/index.d.ts

@@ -4,6 +4,7 @@
 // 	                Kacper Polak <https://github.com/kacepe>
 // 	                Krittanan Pingclasai <https://github.com/kpping>
 // 	                James Munro <https://github.com/jdmunro>
+// 	                Sanders DeNardi <https://github.com/sedenardi>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.1
 
@@ -667,6 +668,30 @@ export interface MysqlError extends Error {
     sqlMessage?: string;
 }
 
+// Result from an insert, update, or delete statement.
+export interface OkPacket {
+    fieldCount: number;
+    /**
+     * The number of affected rows from an insert, update, or delete statement.
+     */
+    affectedRows: number;
+    /**
+     * The insert id after inserting a row into a table with an auto increment primary key.
+     */
+    insertId: number;
+    serverStatus?: number;
+    warningCount?: number;
+    /**
+     * The server result message from an insert, update, or delete statement.
+     */
+    message: string;
+    /**
+     * The number of changed rows from an update statement. "changedRows" differs from "affectedRows" in that it does not count updated rows whose values were not changed.
+     */
+    changedRows: number;
+    protocol41: boolean;
+}
+
 export const enum Types {
     DECIMAL = 0x00, // aka DECIMAL (http://dev.mysql.com/doc/refman/5.0/en/precision-math-decimal-changes.html)
     TINY = 0x01, // aka TINYINT, 1 byte