Ui/pricing metrics page setup

[chelshaw]

This PR sets up the Pricing Metrics UI page (currently based on mock data from the endpoint). This is the bare-bones version of this page, without date filtering or namespaces. Metrics are seen at the route /ui/vault/metrics while the config is at /ui/vault/metrics-config.

When disabled but there is data:

Config:

TODOS:

• Remove http-entities and other old models for metrics

[Monkeychip]

Looks like a test failure. But this looks good. Same with the naming. Are we going to go live with this before the API endpoint is ready?

[chelshaw]

Looks like a test failure. But this looks good. Same with the naming. Are we going to go live with this before the API endpoint is ready?

Good question, we can either merge this (and all forthcoming work) into a sidebranch until we know the API will be ready for release, or merge now and be prepared to revert later. My concern with a sidebranch is that when the ember upgrade is finished we'll have to do that process again for this new work, but hopefully since it's a small section it won't be too painful. Thoughts @Monkeychip ?