perf(profiling): Additionl performance improvements to the profiler - #1991

This change adds additional performance improvements to the profiler after
observing the following:
- extracting filename information is expensive, so add a cache on to allow reuse
  of results
- extracting the full frame information is expensive, but we only need to do it
  once since the subsequent occurrences can reuse previous results
- the abs_path + lineno is sufficient to uniquely identify a frame, so use that
  as the frame key

…ents-to-the-profiler