[Feature] how to set gdbinit by vscode-cmake-tools ?

### Request Overview

* how to use vscode-cmake-tools setting gdbinit ?
https://github.com/gdbinit/Gdbinit/issues/52#issue-3355172387
* I had try setting `.vscode/setting.json`, but not work.
```
"cmake.debugConfig": {
"cwd": "${workspaceFolder}",
"MIMode": "gdb",
"setupCommands": [
{
"description": "load gdbinit file",
"text": "source ~/Gdbinit/gdbinit",
"ignoreFailures": true
}
],
},
```

### Additional Information

version: `1.21.36`

Start by reviewing the cmake.debugConfig setting shown in the issue and the vscode-cmake-tools debugging configuration for version 1.21.36. Determine whether loading a gdbinit file is supported or needs a documented configuration path; done means a verified setup or a clearly scoped implementation request.

Written by the indexing model from the issue text.