Add consolidated results tables

[danielkberry]

We would like to query across experiment results to be able to answer questions such as "which experiments moved retention?". Currently, that's not possible to do. It's also not possible to use BQ's query wildcard functionality to do this, as our results use views and tables. Also, it's not possible to use Looker's experimentation/analysis_statistics explore because that can query only a single slug.

Each AnalysisPeriod-level table would effectively be a union of existing <slug>_<analysis_period> tables.

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