add defmt "--log-format" option

[CvRXX]

With probe-rs you can pass the argument --log-format as described in https://defmt.ferrous-systems.com/custom-log-output#passing-log-format-to-printers. Would it be possible to add this to espflash as well so we can edit the log output?

[jessebraham]

At this time we have a fair bit of work ahead of us here, so I'm not sure we will prioritize this right now. However, I think eventually this would be nice functionality to add. We'd be happy to accept a PR from the community, otherwise one of us can revisit this once our current work has been completed.

[SergioGasquez]

#520 is basically the same issue

[jessebraham]

#520 is basically the same issue

They're related but different, if I'm understanding correctly. In the linked issue they are asking for a different logging format, this issue is asking for support for providing an arbitrary format string.

[CvRXX]

I would be happy to write a PR. Any things I should consider? I'm a beginning rust programmer (month of experience or so) but am experienced in modern c++

[SergioGasquez]

Any things I should consider?

I guess this would only apply when using --log-format defmt, maybe we should use --defmt-format name (?). I would suggest you look at probe-rs source for inspiration of this feature, here is my old branch trying to close #520: main...SergioGasquez:espflash:feat/defmt-verbose, dont think it will help you much but just in case.