Integrate scripts/annotations_import and scripts/ia_healthcheck into scripts/wm

[Mr0grog]

This is a follow-on to #528. The main body of all our scripts now live in web_monitoring/cli/* and scripts/* just serves as entry-points to them. We should also consolidate all the various scripts into commands under wm (except the diffing server, which should stay in a separate universe under wm-diffing-server since it really is quite distinct).

We currently have:

• wm import ia <url>
• wm import ia-known-pages

For ia_healthcheck, I’m thinking we could add wm ia-healthcheck, but I’m also wondering if we should instead reorganize under a top-level ia command:

• wm ia import
• wm ia import-known-pages
• wm ia healthcheck

For annotations_import, I think we should rename the import bit and keep that term reserved for importing pages & versions, so maybe have wm annotations create. Otherwise we could do wm import annotations, but that feels confusing alongside wm import <source> like we have today, and would be orphaned if we re-organized around wm ia instead as suggested above.

/cc @danielballan

[Mr0grog]

Thinking I might drop docopt in favor of the built-in argparse while doing this.

[stale]

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