[vscode] check schema definitions

[mcm1957]

If .vscode/settings.json exists, check json.schemas entries and issue a warning if incorrect or missing

.vscode/settings.json:

"json.schemas": [
{
"fileMatch": ["io-package.json"],
"url": "https://raw.githubusercontent.com/ioBroker/ioBroker.js-controller/master/schemas/io-package.json"
},
{
"fileMatch": ["admin/jsonConfig.json", "admin/jsonCustom.json", "admin/jsonTab.json"],
"url": "https://raw.githubusercontent.com/ioBroker/adapter-react-v5/main/schemas/jsonConfig.json"
}
],