chore: fix define-trait format w/ test

[tippenein]

• closes Clarinet format with define-trait has unreadable output #1685

• fix: un-nesting the trait args properly

New format

(define-trait token-trait
  (
    (transfer? (principal principal uint) (response uint uint)) ;; comment
    (get-balance (principal) (response uint uint))
  )
)

Extra fixes included (from #1689 (comment)):

• fix un-stylized principal value
• remove some nasty old constant formatting and use the same generic code for all of them (define-nft/constant/ft etc...)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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[hugocaillard]

lgtm!