Support Builder Mode in Grafana

[tenmozes]

We need to add support for autocompletion for labels in Builder mode in Grafana

the same feature in Loki

[Loori-R]

Roadmap for Future Improvements:

• Support for the NOT operator. Example expressions: _time:5m error NOT buggy_app and _time:5m log.level:error !(buggy_app OR foobar).
• Support for creating nested queries directly from the UI builder. Currently, it can parse nested queries but does not allow users to create them.
• Support for using pipes in queries. The list of available pipes can be found here.
• Support for various LogsQL filters. The complete list of filters is available here.
• Support for expressions where application identifiers (e.g., buggy_app and foobar) are stored in a specific field. For example: _time:5m log.level:error !(app:buggy_app OR app:foobar)