Generate ES|QL with natural language in Kibana

**What the feature is**

Generate ES|QL with natural language in Kibana. This feature will introduce an in-context Natural Language Processing (NLP) capability directly within the Kibana ES|QL editor. Users will be able to type a question in plain English, and the system will generate the corresponding ES|QL query, replacing their prompt in the editor.

**Value proposition**:

This feature helps both new and experienced users bypass the learning curve of the ES|QL query language. Currently, query creation can be slow, and existing AI assistant workflows require a disjointed, inefficient copy-and-paste action. By integrating Natural Language directly into the editor, users can simply type their intent, allowing the system to instantly generate a complex and validated ES|QL query. This provides a seamless, integrated experience that significantly accelerates data exploration and analysis for everyone.

**Expected outcome**:

- Type a question or command in plain English directly within the query editor.
- Trigger the generation using a simple keyboard shortcut (e.g., Cmd+Enter).
- The system will automatically generate and replace the plain language prompt with a valid ES|QL query, using the currently selected data source for context.
- Users can then immediately inspect, edit, and run the generated query.