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profilers: print user-friendly errors

Prior to this patch, there was no error-checking in profilers,
which resulted in raw Lua errors being reported in cases of
non-existing paths or corrupt file structures. This patch adds
error handling, so all parsing errors are now reported in a
user-friendly manner.

Event parsing is now moved into a separate profiler-agnostic
module.

Tool CLI flag tests are adapted correspondingly to error message
changes.

Resolves tarantool/tarantool#9217
Part of tarantool/tarantool#5994

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