feat(minor): add more flags to the `chat` command

Based on #145 by @stewartoallen, adapted for the beta branch.

[x] Code is up-to-date with the master branch
[x] npm run format to apply eslint formatting
[x] npm run test passes with this change
[x] This pull request links relevant issues as Fixes #0000
[ ] There are new or updated unit tests validating the change
[ ] Documentation has been updated to reflect this change
[x] The new commits and pull request title follow conventions explained in pull request guidelines (PRs that do not follow this convention will not be merged)

withcatai / node-llama-cpp