Speed up metadata parsing

[hasufell]

It appears that parseURI takes a lot of time.

Use https://downloads.haskell.org/~ghcup/tmp/ghcup.eventlog.json to load into https://www.speedscope.app/

[hasufell]

#1214

[hasufell]

Old:

$ time ghcup -s https://ghc.gitlab.haskell.org/ghcup-metadata/ghcup-nightlies-2024-0.0.7.yaml list --show-nightly --since 2024-12-12 -t ghc -r
...

________________________________________________________
Executed in  370.73 millis    fish           external
   usr time  320.08 millis    0.00 micros  320.08 millis
   sys time   50.90 millis  884.00 micros   50.01 millis

New:

$ time ghcup -s https://ghc.gitlab.haskell.org/ghcup-metadata/ghcup-nightlies-2024-0.0.7.yaml list --show-nightly --since 2024-12-12 -t ghc -r
...

________________________________________________________
Executed in  147.32 millis    fish           external
   usr time  130.23 millis    0.28 millis  129.95 millis
   sys time   11.89 millis    1.06 millis   10.83 millis