feat: add support for MOJO v4 (#47)

chore: ruff isort configuration (#42)

We make the isort configuration part of the ruff linter.

fix: austin2speedscope mode detection (#38)

We fix a bug in the austin2speedscope and austin2pprof conversion
tools that prevented valid Austin files to be converted.

Fixes #16.

feat: MOJO stream writer (#37)

We implement a MOJO stream writer to write Austin event into MOJO
files.

update docs

perf: avoid repeatedly re-parsing frames (#27)

* Avoid repeatedly re-parsing frames

This should reduce the effort on parsing frames by a factor of 4 when operating on a `--full` trace.

In that case `ms` will be a list of 4 metrics but we only need to parse the frames once because they are the same in all cases.

Also add a couple of comments which weren't obvious to me on first reading.

* Avoid changing the type of existing variable `frames`

* Code formatting

* Moar black

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Co-authored-by: Gabriele N. Tornetta <P403n1x87@users.noreply.github.com>

feat: add MOJO unwind method (#24)

We implement a method to the MojoFile class to unwind the stream
entirely and collect the data in the metadata and samples attributes for
later inspection.

feat(format): add support for MOJO v3 (#18)

We add support for the version 3 of the MOJO binary spec, which adds
support for sub-interpreter identification.

fix(deps): relax dependency requirements

Some dependency pins have been reported as too strict. We pin them on
the minor version instead of patch to relax them.

Fixes #17.

feat: add support for column-level location data (#15)

This change adds support for the version 2 of the MOJO binary
format specification, which introduces the extra column-level
location information.