RFC: stracy: experimental strace-to-tracy converter

[slomp]

This (stracy) is an attempt to leverage Tracy GUI to visualize and gather statistics around strace logs.
Currently, you'd first capture an strace log with:

strace -ttt -T -f [-k] -o strace.log <program>

and then convert it to a Tracy file with:

tracy-import-strace strace.log strace.tracy

There's quite a bit that could be explored further:

• have a piped mode to consume strace output from stdin
• have a "relay" mode where messages are wired to the server as it consumes the strace output/file
• have a mode for stracy to run the strace command itself (via pipes)

Resolving callstack (-k) symbols is an issue when debug info for system binaries/libs is not be available.

Here's a screenshot zooming around a syscall for reference. Not super exciting, as I have not decided the best course of action regarding extending/merging common callstack frames, and have just been emitting empty-named zones when no symbol is present for the callstack trace: