Facia metrics

Add some facia metrics:

FaciaTool:
 - `ApiUsageCount` - Everything from updates to deletes
 - `ProxyUsageCount` - Expose how many requests are going through the proxy controllers (Ophan and ContentApi)
 - `ExpiredRequestCount` - How many requests have failed the auth expiry constraint that we use in facia tool
 - `DraftPublishCount` - Number of requests to publish a draft collection

Facia:
 - `JsonParsingErrorCount` - Expose problems with JSON coming from S3

Give me the graphs.

@stephanfowler