[FEATURE] Meta version check and migration

[yhmo]

Is your feature request related to a problem? Please describe.
I wish I could use Milvus to check meta version before server start. For old version meta, if it is migrate-able, Milvus migrate it automatically, otherwise, Milvus should give an error message and exit.

Describe the solution you'd like

1. Add a new column into meta, column name: 'version'.
2. Add new interface to Meta class: Status Migrate();
3. Implement the new interface for SqliteMetaImpl/MySQLMetaImpl class;
4. Call Migrate() in DBImpl::Start();

[yhmo]

migration script has been added into project