Add the ability to print module_name:offset, or address of frame

[s1341]

This PR adds the ability to print the module_name:offset (or address, if module_name cannot be found) of each frame. This helps when debugging black-box third-party code.

Currently, module name resolution is implemented by walking the /proc/self/maps pseudo-file. This is available on most unix-like OSes, with the notable exception of macos/ios. As such, this feature is a noop on those system.

The feature is both hidden behind a feature flag (print-addresses), because it has a regex dependency, and must be explicitly turned on by calling print_addresses(true) on the BacktracePrinter.

[athre0z]

Looks good in general, thanks for this!

I added a few minor comments. I'm wondering whether it would make sense to remove the cfg restrictions from print_addresses etc and to only keep it for module_info. The fallback function for module_info could then just always return None/Err. As far as I see, this should be the only thing that's really platform dependent here? Should probably also rename the feature into something like resolve-modules then.

[s1341]

I've applied all review issues. Please let me know if there is anything else you'd like.

[athre0z]

The cfg condition on the module_info fallback doesn't seem to be the proper inverse of the Linux implementation. I commented on how I imagined it, but perhaps there is a good reason for doing it like you're doing it that I just fail to see?

[s1341]

If you could cut a version when you've merged, it would be greatly appreciated.

[athre0z]

Will do. Thanks for the PR! :)

[athre0z]

Done.