[RFE] extend diagnostics with decorations

[DumpySquare]

diagnostics currently provides hovers with severity. Look into extending the diagnostics output with decorators to highlight key values like name, ip address, persistence, ssl, pool members, ...

https://code.visualstudio.com/api/language-extensions/programmatic-language-features#provide-diagnostics
https://github.com/microsoft/vscode-extension-samples/tree/main/code-actions-sample

https://vscode.rocks/decorations/
https://github.com/microsoft/vscode-extension-samples/blob/main/decorator-sample/src/extension.ts