Automatically update left panel on DDL statements

> **Is your feature request related to a problem? Please describe.**
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I'm always frustrated when I create a new database object (e.g. `CREATE SCHEMA test` or `CREATE TABLE t(c INT)`) and have to right-click the **Databases** or **Tables** nodes on the left panel to update the list.

> **Describe the solution you'd like**
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It would be nice if the right panel was automatically updated after executing DDL statements.