stackdriver: get value type and metric kind from metric descriptor instead of from latest metric result

stackdriver: break out aggretation logic into its own directive and controller. also adds tests for new dropdown population logic

so can reuse for annotation query ctrl.

We had incorrectly assumed that a service account could only be connected
to one project.

This is using the {{}} syntax for alias patterns. Might
switch to the  syntax instead.

Explore: Query field fixes

Fix misspelled authentication in Auth overview doc

Still have to figure out if we should have templating for aggregation
fields

Don't use unnest in queries for redshift compatibility