RFC: Adding experiment annotations to Telemetry

[Georg Fritzsche]

Currently we annotate in Telemetry in various ways whether a client
participates in an experiment or is part of a special cohort; using a few
different fields in the environment data or inferring it from active addon
names.

Motivated by the ongoing Shield experiment work for Quantum, we want to add
a standard way to annotate any experiment a Firefox client is participating
in by:
- adding a common data field in the environment
- adding an API to add experiment annotations to it

For details and comment, see this document
<https://docs.google.com/document/d/11kDCK9W6KaPiS_pGcJc8mogc4imSO_ufkn6tJBGUEoM/>
.

Georg
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