System Guard Security Level Baseline

Establishes a baseline SystemGuardSecurityLevel and show the devices that are below that baseline. See https://techcommunity.microsoft.com/t5/Microsoft-Defender-ATP/How-insights-from-system-attestation-and-advanced-hunting-can/ba-p/969252 for full details on this query. And Device Boot Attestation Info and feel free to ping @DepletionMode or @flyingbluemonki on twitter.