parser(dm): support ALTER DATABASE default database (#11504)

[ti-chi-bot]

This is an automated cherry-pick of #11504

What problem does this PR solve?

Issue Number: close #11503

What is changed and how it works?

If the database name is omitted, the statement applies to the default database. In that case, an error occurs if there is no default database.

https://dev.mysql.com/doc/refman/8.4/en/alter-database.html

Check List

Tests

• Unit test
• Manual test

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

DM sync unit support ALTER DATABASE default database SQL

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fzzf678, joccau, lance6716

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[lance6716]

/retest