Telemetry core should be able to support multiple instances of a telemetry session.

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- continuation of knack work to remove global variables
- Interactive would then be able to utilize this to support separate telemetry sessions for each command sent, as well as a session for interactive itself.

### Environment summary

Install Method (e.g. pip, interactive script, apt-get, Docker, MSI, edge build) / CLI version (`az --version`) / OS version / Shell Type (e.g. bash, cmd.exe, Bash on Windows)

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