docs(telemetry): add instrumentation conventions, align telemetry to them #2950

Job	Run time
Unit Test (Linux, Electron 37)	1m 5s
Integration Test (macOS, VS Code stable)	1m 43s
Unit Test (Windows, Electron 42.3.0)	4m 7s
Integration Test (Windows, VS Code stable)	1m 53s
Integration Test (Linux, VS Code stable)	56s
Unit Test (macOS, Electron 42.3.0)	1m 43s
Package	36s
Chromatic	35s
Unit Test (Linux, Electron 42.3.0)	1m 23s
Lint	1m 21s
Integration Test (Linux, VS Code 1.105.0)	55s
	16m 17s

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