Metrics Sampling Interval

[wellsbunk5]

Add the ability to configure the metrics sample interval in ms from the config or override in the sdk command to create a sandbox.

This is so that users can configure how frequently metric samples are collected. It could be faster or slower but the default remains 1 second or 1000 ms. If a user wants to disable sampling completely they set it to 0 and the entire metric sampling task is skipped.

If they disable metric sampling by setting the interval to 0 and then they try to read the metrics from cli/sdk, they will receive and error saying metrics are disabled for that sandbox.

Example config:

{
  "database": {
    "max_connections": 1
  },
  "sandbox_defaults": {
    "metrics_sample_interval_ms": 0
  }
}