Create `ls` builtin

Clear and concise description of the problem

Should be more performant than the system ls

Suggested solution

Built out the Node/Bun API

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

Implemented by e88c122 with regression coverage in b242c30, and shipped in v0.2.0. The native builtin is now the default and falls back to the system ls for unsupported/multi-operand forms.