Add styler:disable_alias_lifting comment directive

[JesseHerrick]

Adds the # styler:disable_alias_lifting comment directive to allow disabling alias lifting in certain files.

Note

Low Risk
Low risk: change is gated behind an explicit # styler:disable_alias_lifting comment and otherwise preserves existing alias lifting behavior; impact is limited to formatter output for opted-out files/snippets.

Overview
Adds a per-file opt-out for alias lifting via a # styler:disable_alias_lifting comment, which prevents Styler from auto-creating new aliases while still applying any existing aliases.

Implements this by propagating a lifting_disabled? flag through ModuleDirectives and short-circuiting lift_aliases/1 when set, with new test coverage for modules, nested modules, and snippets, plus updated documentation.

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