Cli updates - add /tokens command to set number of output tokens in the CLI

[compilebunny]

Describe your changes

Add the ability to set the number of output tokens in the CLI via the /tokens command.
Made further changes as requested.
Signed off commit.

Issue ticket number and link

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• I have added thorough documentation for my code.
• I have tagged PR with relevant project labels. I acknowledge that a PR without labels may be dismissed.
• If this PR addresses a bug, I have provided both a screenshot/video of the original bug and the working solution.

Demo

Steps to Reproduce

Notes

[cebtenzzre]

You still need to sign off on the original commit. Let's continue with #2225 instead of opening a new PR - you can push to the branch (cli_updates) to update it. See https://github.com/nomic-ai/gpt4all/pull/2225/checks?check_run_id=23895881481