Add newly added promscale cmdline flags to timescale doc

[arajkumar]

There are few flags added recently(e.g. --tracing.async-acks) but not documented in timescale official doc.

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Configuration (as applicable)

• Promscale Connector:
• TimescaleDB:
• Prometheus:
• Jaeger:
• OpenTelemetry:

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• Distribution/OS:
• Promscale:
• TimescaleDB:

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