[DSIP-43] Unify index name in Mysql/PG

[ruanwenjun]

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Motivation

Right now, the index name in Mysql/PG might be different, since in PG the index name should be unique in the whole database, but in mysql the index name can only unique in the table.

It's better to unify the index name, this means we need to make the index name unique in the whole database.

Design Detail

Index name template: idx_{table_name}_{index_name}

Compatibility, Deprecation, and Migration Plan

Compatibility with the latest version but need to execute DDL.

Test Plan

Test by IT.

Code of Conduct

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