Change the minimum VS Code version that the Azure Databases extension supports

[v-chenzha]

OS: Win10 Build Version: 20220830.1

Repro Steps:

1. Figure out the oldest vs code version that the extension supports, the version is 1.57.0 as below.
2. Install VS Code 1.57.1 from https://code.visualstudio.com/updates.
3. Install the Azure Databases extension from VSIX.
4. Expand the subscription node.
5. Check whether no error occurs.

Expect: No error occurs.

Actual: An error occurs.