Add residency profiling testing infrastructure to test suite

Record GHC residency when compiling head.hackage and export to the ghc_perf db.

Motivation

Ensuring no regressions / space leaks are introduced with --make mode.

This is the first step: simply collecting the relevant data and making it available for future work.

Rough implementation sketch

• Emit eventlog while building head.hackage
• Ingest log
• Put stats in db (ghc_perf)

import code: (todo: move to ghc/ namespace?) https://gitlab.haskell.org/bgamari/ghc-perf-import