logging: Init component

Creates a new 'logging' component to deploy a Grafana Loki instance to
store tool output, and Grafana Alloy to feed logs into Loki. At this
point this is at a proof of concept level[0] for local development, but
the basics should be there.

[0]: See various TODOs at:
https://wikitech.wikimedia.org/wiki/User:Taavi/Loki_notes_2.0

Bug: T386480


Related MRs:

Edited by Majavah

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