[FEATURE] Add OpenGemini plugin

[aviralgarg05]

[FEATURE] Add OpenGemini plugin

This PR adds support for OpenGemini, a CNCF sandbox project for distributed time-series data storage. Since OpenGemini is fully compatible with InfluxDB v1.x APIs, this plugin implements the necessary data models and components to connect to OpenGemini instances and execute InfluxQL queries.

Plugins Included:

• OpenGeminiDatasource: Datasource plugin for connecting to OpenGemini instances with support for direct URL and HTTP proxy settings.
• OpenGeminiTimeSeriesQuery: Time series query plugin using InfluxQL with support for database selection and variable substitution.

Relates to perses/perses#3716

Description

The plugin is implemented as a new package within the perses/plugins monorepo. Key features include:

• Schema-first Design: CUE schemas define the OpenGeminiDatasource and OpenGeminiTimeSeriesQuery specs, ensuring full validation.
• InfluxDB Compatibility: Uses the /query endpoint and handles Influx-style JSON response transformation (columns/values) into Perses TimeSeries format.
• Editor UI: React-based editors for configuring connection settings and writing InfluxQL queries.
• Monorepo Integration: Fully integrated with the root turbo build system and rsbuild.shared configuration.

Screenshots

N/A - Uses standard Perses form and editor UI components.

Checklist

• Pull request has a descriptive title and context useful to a reviewer.
• Pull request title follows the [FEATURE] Add OpenGemini plugin naming convention.
• All commits have DCO signoffs.

UI Changes

• Code follows the UI guidelines.
• Verified local build successfully using npx turbo run build --filter=@perses-dev/opengemini-plugin.

[jgbernalp]

@aviralgarg05 you need to execute npm install from the root of the project after adding a plugin so the package-lock.json is on sync.