Add VRAM memory and bandwidth sensors for Intel discrete GPUs (#2067)

- Add GPU Memory Total, Used, Free sensors (SmallData type, in MB)
- Add GPU Memory load sensor (percentage)
- Add GPU Memory Read/Write bandwidth sensors (Throughput type, in B/s)
- Use D3DDisplayDevice API to query VRAM usage via Windows kernel
- Match Intel discrete GPUs using PCI vendor/device IDs
- Include fallback detection for Intel GPUs if initial matching fails
- Bandwidth sensors read from Intel GCL telemetry with unit conversion