Add sml ops ble receive command

[Raashid Ansari (silabs-raashid)]

Description

Adds sml ops ble receive so BLE audio collection (previously only via scripts/rpi/ble_receiver.py) is available through the SDK CLI. Configuration uses hybrid resolution: CLI flags override BLE_* environment variables, which override built-in defaults.

Related Issue

N/A

Changes Made

• Add sml ops ble receive with options for device name/address, output dir, UUIDs, labels, audio params, buffer size, and scan timeout
• Extend BLEReceiver with injectable logging, configurable scan timeout, and {label}_{address}_{name}_{timestamp}.wav filenames
• Add BLE_* settings to central Config and log_data_collection() to Logger
• Standardize env vars on BLE_* prefix (BLE_OUTPUT_DIR replaces AUDIO_SAMPLES_DIR with no alias)
• Update RPi scripts, ingestion engines, README, and BLE/RPi docs
• Add tests/test_cli.py and update BLE receiver tests

Checklist

• I have read the Contributor License Agreement.
• I have followed the repository's coding guidelines .
• I have checked the action workflow results and they are all passed.

Additional Notes

Breaking change: AUDIO_SAMPLES_DIR is renamed to BLE_OUTPUT_DIR. Update .env and any automation that referenced the old variable.

Example usage:

sml ops ble receive \
  --device-name "voice_ble_controller" \
  --device-address "AA:BB:CC:DD:EE:FF" \
  --output-dir "./audio_samples" \
  --labels "on,off,unknown"

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