feat: support insert multiple rows into a table using a single SQL insert statement.

[jingchen2222]

Is your feature request related to a problem? Please describe.

We are going to provide the ability to insert multiple database rows in a single SQL insert statement. The ANSI syntax for multi row is shown in the following demo.

Example 1: Insert 2 rows into table t1

CREATE TABLE t1 (
col1 int not null,
col5 bigint not null,
std_ts timestamp not null,
index(key=(col1), ts=col5)
);
      
INSERT INTO t1 VALUES (1, 10000L, 1590738987000L), (2, 20000L, 1590738988000L);

Example 2: Insert 2 rows into table t2 by specifying both the column names and the values to be inserted.

CREATE TABLE t2 (
col1 int not null,
col2 smallint,
col3 float,
col4 double,
col5 bigint not null,
std_date date not null,
str string,
INDEX(key=(col1), ts=col5)
);
INSERT INTO t2 (col1, col5, std_date) VALUES (1, 10000L, '2020-05-27'), (2, 20000L, '2020-05-28');

Describe the solution you'd like

The problem is we only get one single row from given insert statement. So we are going to modify function ExecuteInsert.

bool SQLClusterRouter::ExecuteInsert(const std::string& db, const std::string& sql, ::hybridse::sdk::Status* status) {
  // TODO 
  // parse a sql into a set of rows and put rows into storage one by one
}

More related discussion can be checked from #391.

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