Streaming ingestion of XML log files

[jszwedko]

Requested by user in #6259 (reply in thread)

The user has a situation where logs are written as XML to a log file as a single line. For example:

<?xml version="1.0" encoding="utf-8"?><log><diag contextId="08737cea-ea63-412a-9576-97af909772dc" level="42" timestamp="2020-12-18T13:56:32.083074Z">(Background Thread) StartupActivity not authenticated</diag><diag contextId="08737cea-ea63-412a-9576-97af909772dc" level="42" timestamp="2020-12-18T13:56:32.840987Z">(UI Thread) Set current activity as App.Authorization.Droid.SignInActivity</diag>

Where they'd like to receive the diag tags, and possibly other tags, as they come in.