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It was removed from the docs in 0.2.1 and replaced with writing a [standalone Python engine](https://github.com/ai-dynamo/dynamo/blob/main/docs/guides/dynamo_run.md#writing-your-own-engine-in-python).

Also remove the associated `dynamo-run` feature `python`.

Releasing this in 0.3.0 will resolve #784 and #1109.

Co-authored-by: Rohan Varma <rohanv@rohanv-mlt.client.nvidia.com>
Co-authored-by: Julien Mancuso <jmancuso@nvidia.com>
Co-authored-by: julienmancuso <161955438+julienmancuso@users.noreply.github.com>

Signed-off-by: Jacky <18255193+kthui@users.noreply.github.com>
Signed-off-by: Pavithra Vijayakrishnan <160681768+pvijayakrish@users.noreply.github.com>
Signed-off-by: Chantal D Gama Rose <cdgamarose@nvidia.com>
Signed-off-by: hhzhang16 <54051230+hhzhang16@users.noreply.github.com>
Co-authored-by: Julien Mancuso <jmancuso@nvidia.com>
Co-authored-by: mohammedabdulwahhab <furkhan324@berkeley.edu>
Co-authored-by: mabdulwahhab <mabdulwahhab@nvidia.com>
Co-authored-by: Tushar Sharma <tusharma@nvidia.com>
Co-authored-by: Jacky <18255193+kthui@users.noreply.github.com>
Co-authored-by: Neelay Shah <neelays@nvidia.com>
Co-authored-by: Pavithra Vijayakrishnan <160681768+pvijayakrish@users.noreply.github.com>
Co-authored-by: cdgamarose-nv <cdgamarose@nvidia.com>
Co-authored-by: Anant Sharma <anants@nvidia.com>
Co-authored-by: julienmancuso <161955438+julienmancuso@users.noreply.github.com>
Co-authored-by: Suman Tatiraju <167138127+statiraju@users.noreply.github.com>
Co-authored-by: Piotr Marcinkiewicz <piotrm@nvidia.com>
Co-authored-by: ishandhanani <82981111+ishandhanani@users.noreply.github.com>
Co-authored-by: Tanmay Verma <tanmayv@nvidia.com>

Co-authored-by: mabdulwahhab <mabdulwahhab@nvidia.com>

Also upgrade the cargo resolver to v3, the default.

New clippy lints:
- `next_back()` instead of `last()` for a double-ended iterator. That avoids walking the whole list.
- ` repeat_n` instead of `repeat.take`. That avoids cloning.
- Doc indenting

Co-authored-by: Julien Mancuso <jmancuso@nvidia.com>
Co-authored-by: Hannah Zhang <hannahz@nvidia.com>
Co-authored-by: Biswa Panda <biswa.panda@gmail.com>
Co-authored-by: Maksim Khadkevich <mkhadkevich@nvidia.com>

Co-authored-by: Neelay Shah <neelays@nvidia.com>