This commit provides custom metrics, so we can group requests
into their route paths and not by the arguments given, e.g.
/pkgbase/some-package -> /pkgbase/{name}. We also count RPC
requests as `http_api_requests_total`, split by the RPC
query "type" argument.

- `http_api_requests_total`
    - Labels: ["type", "status"]
- `http_requests_total`
    - Number of HTTP requests in total.
    - Labels: ["method", "path", "status"]

Signed-off-by: Kevin Morris <kevr@0cost.org>