Fix/serial ddl

[KKould]

What problem does this PR solve?

add mdl (MetaDataLock) to DataBase to make DDL serial

DDL is not allowed to be executed in DBTransaction. This is because MySQL will cause the transaction to be implicitly committed when Transaction executes DDL, and DDL will be executed as a separate transaction.

Issue link:

• Bug: Only one related transaction should be allowed to exist when making a DDL statement #171
• Reduce performance issues caused by Build Plan #162

Code changes

• Has Rust code change
• Has CI related scripts change

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Note for reviewer