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

从 CREATE TABLE 的解析器入口点开始，跟踪现有语句形式的处理方式。使用报告中的 CREATE TABLE tbl AS (SELECT 1) 示例作为初始案例，并将能够识别该形式且不使现有 CREATE TABLE 语法出现回归视为工作完成。