Add eventlog flag -lI to emit IPE events, similar to -DI

Wen Kokkerequested to merge
wip/wenkokke/trace-ipe into master

This MR adds the eventlog flag -lI as described in #27239.

Furthermore, this MR updates GHC.RTS.Flags where it adds both TraceFlags.traceIpe and DebugFlags.ipe.

This MR depends on !15936 (closed).

Edited by Wen Kokke

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