Add lwtnn to AtlasExternals

Joshua Wyatt Smithrequested to merge
jwsmith/atlasexternals:out_source_lwtnn into master

Hi @akraszna,

This MR adds lwtnn to Athena, specifically, so it can be used in packages like AnalysisTop and other packages like BoostedJetTaggers:https://gitlab.cern.ch/atlas/athena/merge_requests/3085.

Is AnalysisBaseExternals the correct place to include lwtnn so that it gets found/used by both above mentioned packages?

Edited by Joshua Wyatt Smith

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