Add stats --json output

[oddsun]

Closes: #187

Describe your changes
Added json flag and implementation to allow export stats to json file using memray stats --json ....

Testing performed
Added 2 unit tests

• tests/unit/test_stats_reporter.py::test_stats_output: test printing stats to terminal
• tests/unit/test_stats_reporter.py::test_stats_output_json: test output json stats

Additional context
pycon2023

[oddsun]

new forced-push:

• rebased to head of main
• fixed news issue
• fixed mypy errors

[oddsun]

Fixed missing empty line by running pre-commit run --all-files.

I realized I can test PR checks by creating PR to forked "main". All checks passed in test PR: oddsun#1.

Maybe this approach could be added to CONTRIBUTING.md, helping decreasing the instances of failed checks.

[godlygeek]

I've reviewed this, and spotted a few small things that will need to be fixed.

[godlygeek]

On top of those, can you also update your commit message to use your real name in the signed-off-by? Per https://github.com/bloomberg/memray/blob/main/CONTRIBUTING.md#contribution-licensing we need a real name for the DCO signoff, not a pseudonym.

[oddsun]

Got it. Do you want me to make the changes and squash into a single commit again and then update the signoff?

[godlygeek]

Got it. Do you want me to make the changes and squash into a single commit again and then update the signoff?

Yes, that would be perfect!

[godlygeek]

I've pushed a few more commits here to polish this a little bit: adding some documentation, adding support for --output and --force like our other subcommands that output files accept, and tweaking the format of the JSON a little bit to make it easier to use.

@pablogsal Since I've edited this pretty heavily now, would you mind giving this a review?

[pablogsal]

I've pushed a few more commits here to polish this a little bit: adding some documentation, adding support for --output and --force like our other subcommands that output files accept, and tweaking the format of the JSON a little bit to make it easier to use.

@pablogsal Since I've edited this pretty heavily now, would you mind giving this a review?

Will review this today or monday 👍

[godlygeek]

The 3.8 tests are failing because of ipython/ipython#14053 - either the IPython maintainers need to yank the 8.13 release, or we need to land #380 and rebase this.

[sarahmonod]

The 3.8 tests are failing because of ipython/ipython#14053 - either the IPython maintainers need to yank the 8.13 release, or we need to land #380 and rebase this.

I've landed #380, we can always remove that workaround if and when the IPython maintainers yank the 8.13 release.

EDIT: the IPython maintainers have now yanked 8.13 and so #381 reverted the #380 PR ^^