openwisp / netjsongraph.js / 21760645092

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[change] Reduced size, provided 2 builds: full/echarts-only #392

**Two Build Variants Available:**
- **Full Bundle** (`yarn build:full`): Complete library with ECharts and Leaflet bundled
- **ECharts-Only Bundle** (`yarn build:echarts-only`): Library without Leaflet (~144 KiB smaller)

**For Projects with Existing Leaflet:**
Projects already using Leaflet (e.g., via django-leaflet in OpenWISP)
can now use the ECharts-only variant. Leaflet must be available as
a global `L` object before loading NetJSONGraph.

**Other changes:**
- Removed large GraphGL example data files (~40MB)
- Added compression plugin for `.gz` and `.br` file generation
- `package.json` `main` field now points to
  `dist/netjsongraph.min.js` instead of `src/js/netjsongraph.js`
- Webpack Bundle Analyzer Support:
  new stats commands to analyze bundle composition
- Dynamic Leaflet Loading: The echarts-only bundle can dynamically load Leaflet from CDN for development/demo purposes

**Breaking changes**
- Leaflet is now a **peer dependency** (optional),
  projects using the ECharts-only bundle must provide Leaflet themselves

Closes #392

Signed-off-by: Sankalp <sankalp.nex@gmail.com>
Co-authored-by: Federico Capoano <f.capoano@openwisp.io>

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