Add support for CREATE TABLE tbl AS query_expression

Currently the parser does not recognize CREATE TABLE statements in the form of CREATE TABLE tbl AS (SELECT 1).

Relevant syntax (link):

CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name
    [(create_definition,...)]
    [table_options]
    [partition_options]
    [IGNORE | REPLACE]
    [AS] query_expression  #<<<

phpMyAdmin version: 4.7.4

從 CREATE TABLE 的 parser 入口點開始，追蹤現有語句形式的處理方式。使用回報的 CREATE TABLE tbl AS (SELECT 1) 範例作為初始案例，並將能夠辨識該形式且不使現有 CREATE TABLE 語法發生回歸視為工作完成。