Add snapshot analysis creation/lookup, baseline chooser

[lukesonnet]

Features and Changes

As part of the Snapshot Refactor (#1284), one of the key next steps was enabling creating multiple analyses that rely on one snapshot and set of queries. This would be done through quick calls to gbstats, stored side-by-side, and accessed by their ExperimentSnapshotAnalysisSettings which represents meta-data about the analysis.

This PR is one way to achieve this goal with the new Snapshot model, and use it for a simple feature.

• Adds POST endpoint for creating snapshot analyses, and createSnapshotAnalyses which can create multiple snapshot analyses. Much of this code duplicates ExperimentQueryRunner so we should consider how to keep this dry.
• Adds a hook to useSnapshot() to allow for setting the ExperimentSnapshotAnalysisSettings on the fly and to retrieve the right data for a given analysisSettings object.

TODO:

• Add functionality to reports
• Use different approach to handling variation order than sorting
• Actually hook up to new BaselineChooser

Here's the call that this PR used to fire in AnalysisSettingsBar when you messed with the baseline chooser I had built into an old commit (but have ripped out when rebasing on results-table-variation-filtering:

onChange={async (i) => {
  const newSettings: ExperimentSnapshotAnalysisSettings = {
    ...analysis.settings,
    baselineVariationIndex: Number(i),
  };
  if (!getSnapshotAnalysis(snapshot, newSettings)) {
    await apiCall(`/snapshot/${snapshot.id}/analysis`, {
      method: "POST",
      body: JSON.stringify({
        analysisSettings: newSettings,
      }),
    })
      .then(() => {
        track("Experiment Analysis: switch baseline");
      })
      .catch((e) => {
        setRefreshError(e.message);
      });
  }
  setAnalysisSettings(newSettings);
  mutate();
}}

Dependencies

#1631

Testing

TODO

[github-actions]

Your preview environment pr-1515-bttf has been deployed.

Preview environment endpoints are available at:

• https://growthbook-3100-pr-1515-bttf.growthbook.okteto.dev
• https://growthbook-3000-pr-1515-bttf.growthbook.okteto.dev

[lukesonnet]

Can't approve my own PR, but this looks good to me. One comment about the UX when running queries and another tiny comment.