[Improvement] Support load indexes on multiple columns

[danhuawang]

What would you like to be improved?

1. create the following table in mysql

CREATE TABLE test (
    id         INT NOT NULL,
    last_name  CHAR(30) NOT NULL,
    first_name CHAR(30) NOT NULL,
    PRIMARY KEY (id),
    INDEX name (last_name,first_name)
);

2.load the table in gravitino
there's only PRIMARY KEY indexes

It's better to support load another indexes

How should we improve?

No response

[justinmclean]

Similar issue in #2440