Add an sleep setting

[eracknaphobia]

Is your feature request related to a problem? Please describe.

The R900 I use for reading my water meter consumes a lot of CPU and I don't really need a down to the minute reading on water consumption.

Describe the solution you'd like

Add an optional setting to the meter configuration to sleep for x seconds after a message is received

meters:
  - id: 12345678
    protocol: scm
    name: My gas meter
    type: gas
    multiplier: 0.01
    unit_of_measurement: ccf
    sleep_interval: 3600

[github-actions[bot]]

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