function callbackInitialize(shim, mysql) {
  shim.setDatastore(shim.MYSQL)
  shim[symbols.wrappedPoolConnection] = false

  shim.wrapReturn(mysql, 'createConnection', wrapCreateConnection)
  shim.wrapReturn(mysql, 'createPool', wrapCreatePool)
  shim.wrapReturn(mysql, 'createPoolCluster', wrapCreatePoolCluster)
}
Used to instrument `mysql` and `mysql2` packages
the `mysql2/promise` instrumentation is below in `promiseInitialize`

@param {Shim} shim instance of shim
@param {object} mysql package to instrument