## Summary
Implements configurable query execution timeout controls to prevent
poorly optimized or excessive queries from consuming excessive server
resources, causing performance degradation, or crashing the Zabbix
server.
Fixes: https://github.com/grafana/oss-big-tent-squad/issues/127
## Problem
Previously, the plugin only had an HTTP connection timeout (`timeout`)
that controlled individual API request timeouts. However, a complete
query execution could involve multiple API calls and run indefinitely if
not properly controlled, potentially causing resource exhaustion.
## Solution
Added a new `queryTimeout` setting that enforces a maximum execution
time for entire database queries initiated by the plugin. Queries
exceeding this limit are automatically terminated with proper error
handling and logging.
## Testing
1. Configure a datasource with `queryTimeout` set to a low value (e.g.,
5 seconds)
2. Execute a query that would normally take longer than the timeout
3. Verify that:
- Query is terminated after the timeout period
- Error message indicates timeout occurred
- Logs contain timeout warning with query details
- Other queries in the same request continue to execute
## Notes
- `queryTimeout` is separate from `timeout` (HTTP connection timeout)
- `queryTimeout` applies to the entire query execution, which may
involve multiple API calls
- Default value of 60 seconds ensures reasonable protection while
allowing normal queries to complete
- Timeout errors are logged with query refId, queryType, timeout
duration, and datasourceId for troubleshooting
