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Adds 'main' and 'metrics' packages. (#3)

* Adds 'main' and 'metrics' packages.

* Changes in response to comments and requests in PR #3.

* Changes from comments and suggestions in PR #3.

* Fixes a few tests for metrics package.

* Renames struct element intervalSeries to just interval. Renames Prom metric lable 'node' to 'machine'.

* Adds two new Prometheus metrics: disco_collect_duration_seconds (a histogram) and disco_collect_errors_total.

* Outputs JSONL instead of indented JSON. Removes the node/machine label from Prom metrics (k8s auto-discovery should add it automatically).

* Tests archive.Write by writing a set of models as JSONL to a file, then reading that file back into new set of models, and then checking for equality between the two.

* Moves collectDuration and collectErrors out of the Metrics struct and instead as global package variables. Handles and unhandled error case.

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