[FEATURE] Add OpenGemini plugin

This adds support for OpenGemini, a CNCF sandbox project for time-series data storage that is compatible with InfluxDB v1.x APIs.

Plugins included:
- OpenGeminiDatasource: Datasource plugin for connecting to OpenGemini instances
- OpenGeminiTimeSeriesQuery: Time series query plugin using InfluxQL

Relates to perses/perses#3716

Signed-off-by: aviralgarg05 <gargaviral99@gmail.com>

Author: aviralgarg05

opengemini/.gitignore

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+node_modules/
+dist/
+lib/
+*.log
+.DS_Store

opengemini/README.md

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+# OpenGemini Plugin for Perses
+
+This plugin provides OpenGemini datasource and time series query support for [Perses](https://github.com/perses/perses).
+
+## Overview
+
+[OpenGemini](https://github.com/openGemini/openGemini) is a CNCF sandbox project - an open-source distributed time-series database with high concurrency, high performance, and high scalability. It is fully compatible with InfluxDB v1.x Line Protocol, InfluxQL, and read/write APIs.
+
+## Plugins Included
+
+### OpenGeminiDatasource
+
+A datasource plugin for connecting to OpenGemini instances. Supports:
+
+- Direct URL connection
+- HTTP Proxy configuration
+
+### OpenGeminiTimeSeriesQuery
+
+A time series query plugin that uses InfluxQL to query data from OpenGemini. Features:
+
+- InfluxQL query support
+- Database selection
+- Variable substitution
+
+## Installation
+
+1. Build the plugin:
+
+   ```bash
+   cd plugins/opengemini
+   npm install
+   npm run build
+   ```
+
+2. Copy the built plugin to your Perses plugins directory.
+
+3. Restart Perses to load the plugin.
+
+## Usage
+
+### Creating a Datasource
+
+1. Go to Admin > Global Datasources or Project > Datasources
+2. Click "Add Datasource"
+3. Select "OpenGeminiDatasource"
+4. Configure the URL to your OpenGemini instance (default port: 8086)
+
+### Creating Queries
+
+1. Create or edit a dashboard panel
+2. Select "OpenGeminiTimeSeriesQuery" as the query type
+3. Enter your database name
+4. Write your InfluxQL query
+
+Example query:
+
+```sql
+SELECT mean("value") FROM "cpu" WHERE time > now() - 1h GROUP BY time(1m), "host"
+```
+
+## License
+
+Apache License 2.0

opengemini/cue.mod/module.cue

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+module: "github.com/perses/plugins/opengemini@v0"
+language: {
+	version: "v0.15.1"
+}
+source: {
+	kind: "git"
+}
+deps: {
+	"github.com/perses/perses/cue@v0": {
+		v:       "v0.53.0-rc.0"
+		default: true
+	}
+	"github.com/perses/shared/cue@v0": {
+		v:       "v0.53.0-rc.1"
+		default: true
+	}
+}