Introduce orjson as optional dependency

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Relates to #661

• ✨ Implements a JsonUtil module to handle the functionality of swapping between json or orjson

  • handles custom kwargs previously being passed to json
  • implements JsonUtil.dump_bytes to avoid the numerous instances of encoding and decoding strings unnecessarily (since orjson returns bytes by default)

• 🎨 Replaces import json with from nats.json_util import JsonUtil as json

• ➕ Adds orjson optional dependency to pyproject.toml and setup.py

• ✅ Updates tests to accommodate changes, and the fact that orjson.dumps does not include spaces.

• 👷 Add orjson runs to travis jobs (for python 3.11 -> 3.13)

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Looks like some dev dependencies require >=py3.9 after I updated the lock file

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Might want to do a Pipfile update + dropping 3.8 in a separate PR

Workflows complain about "ModuleNotFoundError: No module named 'tomli'"
Not sure what's the right solution here (not that familiar with Pipfile)

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The tests fail with ModuleNotFoundError: No module named 'tomli'

Can anyone help understand how to fix this?

cc active contributors: @caspervonb @wallyqs

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Can I please get some help with this? @wallyqs @caspervonb

I'd like to contribute some other things to this repo too, so I'm mainly curious what the status of the project is -- are there pending contributions that will address the Pipfile update?

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The answer is that I should not have done a Pipfile lock update. Doing so essentially drops py3.8 support.

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Success 🎉

@wallyqs @caspervonb sorry for the spam - now just want to say it's ready for review

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Previous test failure was intermittent -- everything passes after an empty commit