sg: investigate analytics we can/should collect

Created by: bobheadxi

Ideas:

• https://github.com/sourcegraph/sourcegraph/discussions/25983
• Potential integration with OkayHQ, geared towards identifying blockers/points of improvement, potentially useful features that could be exposed better, and/or unused features. Emphasis on not measuring productivity with sg analytics, but about things we can do to improve it.
• Collect performance metrics, e.g. time-to-command-run to keep latency down ("sg should be fast")