Support log plugin for auto instrumentation

[stevejgordon]

As of today, the plugin architecture does not offer an option to configure the logging signal. This issue tracks one suggestion for the ILoggerBuilder, which is currently used by auto instrumentation during bootstrapping.

Once that is implemented in some form, we should ensure we hook in our defaults. Right now, we only set the OtlpExporter, which the auto instrumentation also supports, so it's not a blocker. If we introduce add any further logging customisation, then we would depend on the upstream change being completed first.