Add support for both Enquirer and Inquirer (configurable prompt engine)

[sathwik-14]

Currently, quikjs uses Inquirer for CLI prompts. Some developers prefer Enquirer for its async/modern design.
Add a config or environment variable that lets users switch between the two (e.g., QUIK_PROMPT_LIB=enquirer).

Acceptance Criteria:

If Enquirer is installed, user can toggle between Inquirer or Enquirer.

Backward compatible with existing behavior.