feat: prevent start flag and debug logs

[marvinmarnold]

Issue

• Link: Incorporate gateway-rs api changes hm-pyhelper#179
• Summary: More verbose logging and added env var flag to prevent miner from starting

How

• Use stdio logging. syslog logging causes miner to crash

# /usr/bin/helium_gateway -c /etc/helium_gateway server
thread 'main' panicked at 'syslog drain: Custom { kind: Other, error: "Initialization" }', src/main.rs:53:18

• PREVENT_START_GATEWAYRS can be set to 1 to prevent the miner from starting. This is helpful for debugging the miner manually.

Screenshots

References

Checklist

• Tests added
• Cleaned up commit history (rebase!)
• Documentation added
• Thought about variable and method names