Make @fig/complete-commander an optional dependency to reduce bundle size

[hbsnmyj]

Is there an existing issue that is already proposing this?

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Is your feature request related to a problem? Please describe it

Hi folks,

PR #1045 introduces a dependency to @fig/complete-commander, which pulls in prettier as a hard dependency. As of 3.12.5, prettier consumes 8.2 MiB spaces in prod builds, making depending on nest-commander much heavier than it should be.

Can we make it an optional dependency? Thanks a lot.

Describe the solution you'd like

Make @fig/complete-commander an optional dependency.

Teachability, documentation, adoption, migration strategy

No response

What is the motivation / use case for changing the behavior?

Reduce transitive closure of this package smaller.