Improve logging to kusto for better debugging

[frank-pang-msft]

Some info is missing in the kusto logs that are present in the local logs that makes it difficult to debug.

• Log specific command being executed at startup (install/enable/update/etc)
• Include extension sequence number and pid at startup for debugging from GuestAgent logs when extension logs are missing or seqNum.status file is missing
• Log overall status file so we have better debugging when VMExtensionProvisioning fails. This status is only sent when extension transitions between Transitioning -> Success/Error or whenever extension starts up.
• Update azure-extension-platform package to pull in change to increase precision of event timestamp to include milliseconds/nanoseconds, Previously it was RFC3339, which is in format yyyy-mm-ddThh:mm:ssZ, which causes issue in sorting timestamps. Use RFC3339Nano for better timestamp precision in extension events azure-extension-platform#34

[klugorosado]

LGTM