perf: do not import `Lean.Elab.Idbg` in `LeanIR`

Its `@[extern]` counterpart `Idbg.idbgClientLoop` is only declared in `Lean.Setup` and never called by `leanir`, so the test exempts it. The import was however the only thing initializing `Lean.Parser`, which implements the parenthesizer and formatter hooks of the pretty printer; import that directly.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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